drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/fcntl.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/ioport.h>
  41 #include <linux/in.h>
  42 #include <net/ip.h>
  43 #include <linux/ip.h>
  44 #include <linux/icmp.h>
  45 #include <linux/icmpv6.h>
  46 #include <linux/tcp.h>
  47 #include <linux/udp.h>
  48 #include <linux/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/init.h>
  51 #include <linux/timer.h>
  52 #include <linux/socket.h>
  53 #include <linux/ctype.h>
  54 #include <linux/inet.h>
  55 #include <linux/bitops.h>
  56 #include <linux/io.h>
  57 #include <asm/dma.h>
  58 #include <linux/uaccess.h>
  59 #include <linux/errno.h>
  60 #include <linux/netdevice.h>
  61 #include <linux/inetdevice.h>
  62 #include <linux/igmp.h>
  63 #include <linux/etherdevice.h>
  64 #include <linux/skbuff.h>
  65 #include <net/sock.h>
  66 #include <linux/rtnetlink.h>
  67 #include <linux/smp.h>
  68 #include <linux/if_ether.h>
  69 #include <net/arp.h>
  70 #include <linux/mii.h>
  71 #include <linux/ethtool.h>
  72 #include <linux/if_vlan.h>
  73 #include <linux/if_bonding.h>
  74 #include <linux/jiffies.h>
  75 #include <linux/preempt.h>
  76 #include <net/route.h>
  77 #include <net/net_namespace.h>
  78 #include <net/netns/generic.h>
  79 #include <net/pkt_sched.h>
  80 #include <linux/rculist.h>
  81 #include <net/flow_dissector.h>
  82 #include <net/xfrm.h>
  83 #include <net/bonding.h>
  84 #include <net/bond_3ad.h>
  85 #include <net/bond_alb.h>
  86 #if IS_ENABLED(CONFIG_TLS_DEVICE)
  87 #include <net/tls.h>
  88 #endif
  89
  90 #include "bonding_priv.h"
  91
  92 /*---------------------------- Module parameters ----------------------------*/
  93
  94 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  95
  96 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  97 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  98 static int num_peer_notif = 1;
  99 static int miimon;
 100 static int updelay;
 101 static int downdelay;
 102 static int use_carrier  = 1;
 103 static char *mode;
 104 static char *primary;
 105 static char *primary_reselect;
 106 static char *lacp_rate;
 107 static int min_links;
 108 static char *ad_select;
 109 static char *xmit_hash_policy;
 110 static int arp_interval;
 111 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 112 static char *arp_validate;
 113 static char *arp_all_targets;
 114 static char *fail_over_mac;
 115 static int all_slaves_active;
 116 static struct bond_params bonding_defaults;
 117 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 118 static int packets_per_slave = 1;
 119 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 120
 121 module_param(max_bonds, int, 0);
 122 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 123 module_param(tx_queues, int, 0);
 124 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 125 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 126 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 127                                "failover event (alias of num_unsol_na)");
 128 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 129 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 130                                "failover event (alias of num_grat_arp)");
 131 module_param(miimon, int, 0);
 132 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 133 module_param(updelay, int, 0);
 134 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 135 module_param(downdelay, int, 0);
 136 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 137                             "in milliseconds");
 138 module_param(use_carrier, int, 0);
 139 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 140                               "0 for off, 1 for on (default)");
 141 module_param(mode, charp, 0);
 142 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 143                        "1 for active-backup, 2 for balance-xor, "
 144                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 145                        "6 for balance-alb");
 146 module_param(primary, charp, 0);
 147 MODULE_PARM_DESC(primary, "Primary network device to use");
 148 module_param(primary_reselect, charp, 0);
 149 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 150                                    "once it comes up; "
 151                                    "0 for always (default), "
 152                                    "1 for only if speed of primary is "
 153                                    "better, "
 154                                    "2 for only on active slave "
 155                                    "failure");
 156 module_param(lacp_rate, charp, 0);
 157 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 158                             "0 for slow, 1 for fast");
 159 module_param(ad_select, charp, 0);
 160 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 161                             "0 for stable (default), 1 for bandwidth, "
 162                             "2 for count");
 163 module_param(min_links, int, 0);
 164 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 165
 166 module_param(xmit_hash_policy, charp, 0);
 167 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 168                                    "0 for layer 2 (default), 1 for layer 3+4, "
 169                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 170                                    "4 for encap layer 3+4, 5 for vlan+srcmac");
 171 module_param(arp_interval, int, 0);
 172 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 173 module_param_array(arp_ip_target, charp, NULL, 0);
 174 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 175 module_param(arp_validate, charp, 0);
 176 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 177                                "0 for none (default), 1 for active, "
 178                                "2 for backup, 3 for all");
 179 module_param(arp_all_targets, charp, 0);
 180 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 181 module_param(fail_over_mac, charp, 0);
 182 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 183                                 "the same MAC; 0 for none (default), "
 184                                 "1 for active, 2 for follow");
 185 module_param(all_slaves_active, int, 0);
 186 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 187                                      "by setting active flag for all slaves; "
 188                                      "0 for never (default), 1 for always.");
 189 module_param(resend_igmp, int, 0);
 190 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 191                               "link failure");
 192 module_param(packets_per_slave, int, 0);
 193 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 194                                     "mode; 0 for a random slave, 1 packet per "
 195                                     "slave (default), >1 packets per slave.");
 196 module_param(lp_interval, uint, 0);
 197 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 198                               "the bonding driver sends learning packets to "
 199                               "each slaves peer switch. The default is 1.");
 200
 201 /*----------------------------- Global variables ----------------------------*/
 202
 203 #ifdef CONFIG_NET_POLL_CONTROLLER
 204 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 205 #endif
 206
 207 unsigned int bond_net_id __read_mostly;
 208
 209 static const struct flow_dissector_key flow_keys_bonding_keys[] = {
 210         {
 211                 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
 212                 .offset = offsetof(struct flow_keys, control),
 213         },
 214         {
 215                 .key_id = FLOW_DISSECTOR_KEY_BASIC,
 216                 .offset = offsetof(struct flow_keys, basic),
 217         },
 218         {
 219                 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 220                 .offset = offsetof(struct flow_keys, addrs.v4addrs),
 221         },
 222         {
 223                 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 224                 .offset = offsetof(struct flow_keys, addrs.v6addrs),
 225         },
 226         {
 227                 .key_id = FLOW_DISSECTOR_KEY_TIPC,
 228                 .offset = offsetof(struct flow_keys, addrs.tipckey),
 229         },
 230         {
 231                 .key_id = FLOW_DISSECTOR_KEY_PORTS,
 232                 .offset = offsetof(struct flow_keys, ports),
 233         },
 234         {
 235                 .key_id = FLOW_DISSECTOR_KEY_ICMP,
 236                 .offset = offsetof(struct flow_keys, icmp),
 237         },
 238         {
 239                 .key_id = FLOW_DISSECTOR_KEY_VLAN,
 240                 .offset = offsetof(struct flow_keys, vlan),
 241         },
 242         {
 243                 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
 244                 .offset = offsetof(struct flow_keys, tags),
 245         },
 246         {
 247                 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
 248                 .offset = offsetof(struct flow_keys, keyid),
 249         },
 250 };
 251
 252 static struct flow_dissector flow_keys_bonding __read_mostly;
 253
 254 /*-------------------------- Forward declarations ---------------------------*/
 255
 256 static int bond_init(struct net_device *bond_dev);
 257 static void bond_uninit(struct net_device *bond_dev);
 258 static void bond_get_stats(struct net_device *bond_dev,
 259                            struct rtnl_link_stats64 *stats);
 260 static void bond_slave_arr_handler(struct work_struct *work);
 261 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 262                                   int mod);
 263 static void bond_netdev_notify_work(struct work_struct *work);
 264
 265 /*---------------------------- General routines -----------------------------*/
 266
 267 const char *bond_mode_name(int mode)
 268 {
 269         static const char *names[] = {
 270                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 271                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 272                 [BOND_MODE_XOR] = "load balancing (xor)",
 273                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 274                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 275                 [BOND_MODE_TLB] = "transmit load balancing",
 276                 [BOND_MODE_ALB] = "adaptive load balancing",
 277         };
 278
 279         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 280                 return "unknown";
 281
 282         return names[mode];
 283 }
 284
 285 /**
 286  * bond_dev_queue_xmit - Prepare skb for xmit.
 287  *
 288  * @bond: bond device that got this skb for tx.
 289  * @skb: hw accel VLAN tagged skb to transmit
 290  * @slave_dev: slave that is supposed to xmit this skbuff
 291  */
 292 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 293                         struct net_device *slave_dev)
 294 {
 295         skb->dev = slave_dev;
 296
 297         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 298                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 299         skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 300
 301         if (unlikely(netpoll_tx_running(bond->dev)))
 302                 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 303
 304         return dev_queue_xmit(skb);
 305 }
 306
 307 bool bond_sk_check(struct bonding *bond)
 308 {
 309         switch (BOND_MODE(bond)) {
 310         case BOND_MODE_8023AD:
 311         case BOND_MODE_XOR:
 312                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
 313                         return true;
 314                 fallthrough;
 315         default:
 316                 return false;
 317         }
 318 }
 319
 320 /*---------------------------------- VLAN -----------------------------------*/
 321
 322 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 323  * We don't protect the slave list iteration with a lock because:
 324  * a. This operation is performed in IOCTL context,
 325  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 326  * c. Holding a lock with BH disabled while directly calling a base driver
 327  *    entry point is generally a BAD idea.
 328  *
 329  * The design of synchronization/protection for this operation in the 8021q
 330  * module is good for one or more VLAN devices over a single physical device
 331  * and cannot be extended for a teaming solution like bonding, so there is a
 332  * potential race condition here where a net device from the vlan group might
 333  * be referenced (either by a base driver or the 8021q code) while it is being
 334  * removed from the system. However, it turns out we're not making matters
 335  * worse, and if it works for regular VLAN usage it will work here too.
 336 */
 337
 338 /**
 339  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 340  * @bond_dev: bonding net device that got called
 341  * @proto: network protocol ID
 342  * @vid: vlan id being added
 343  */
 344 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 345                                 __be16 proto, u16 vid)
 346 {
 347         struct bonding *bond = netdev_priv(bond_dev);
 348         struct slave *slave, *rollback_slave;
 349         struct list_head *iter;
 350         int res;
 351
 352         bond_for_each_slave(bond, slave, iter) {
 353                 res = vlan_vid_add(slave->dev, proto, vid);
 354                 if (res)
 355                         goto unwind;
 356         }
 357
 358         return 0;
 359
 360 unwind:
 361         /* unwind to the slave that failed */
 362         bond_for_each_slave(bond, rollback_slave, iter) {
 363                 if (rollback_slave == slave)
 364                         break;
 365
 366                 vlan_vid_del(rollback_slave->dev, proto, vid);
 367         }
 368
 369         return res;
 370 }
 371
 372 /**
 373  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 374  * @bond_dev: bonding net device that got called
 375  * @proto: network protocol ID
 376  * @vid: vlan id being removed
 377  */
 378 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 379                                  __be16 proto, u16 vid)
 380 {
 381         struct bonding *bond = netdev_priv(bond_dev);
 382         struct list_head *iter;
 383         struct slave *slave;
 384
 385         bond_for_each_slave(bond, slave, iter)
 386                 vlan_vid_del(slave->dev, proto, vid);
 387
 388         if (bond_is_lb(bond))
 389                 bond_alb_clear_vlan(bond, vid);
 390
 391         return 0;
 392 }
 393
 394 /*---------------------------------- XFRM -----------------------------------*/
 395
 396 #ifdef CONFIG_XFRM_OFFLOAD
 397 /**
 398  * bond_ipsec_add_sa - program device with a security association
 399  * @xs: pointer to transformer state struct
 400  **/
 401 static int bond_ipsec_add_sa(struct xfrm_state *xs)
 402 {
 403         struct net_device *bond_dev = xs->xso.dev;
 404         struct bonding *bond;
 405         struct slave *slave;
 406
 407         if (!bond_dev)
 408                 return -EINVAL;
 409
 410         bond = netdev_priv(bond_dev);
 411         slave = rcu_dereference(bond->curr_active_slave);
 412         xs->xso.real_dev = slave->dev;
 413         bond->xs = xs;
 414
 415         if (!(slave->dev->xfrmdev_ops
 416               && slave->dev->xfrmdev_ops->xdo_dev_state_add)) {
 417                 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
 418                 return -EINVAL;
 419         }
 420
 421         return slave->dev->xfrmdev_ops->xdo_dev_state_add(xs);
 422 }
 423
 424 /**
 425  * bond_ipsec_del_sa - clear out this specific SA
 426  * @xs: pointer to transformer state struct
 427  **/
 428 static void bond_ipsec_del_sa(struct xfrm_state *xs)
 429 {
 430         struct net_device *bond_dev = xs->xso.dev;
 431         struct bonding *bond;
 432         struct slave *slave;
 433
 434         if (!bond_dev)
 435                 return;
 436
 437         bond = netdev_priv(bond_dev);
 438         slave = rcu_dereference(bond->curr_active_slave);
 439
 440         if (!slave)
 441                 return;
 442
 443         xs->xso.real_dev = slave->dev;
 444
 445         if (!(slave->dev->xfrmdev_ops
 446               && slave->dev->xfrmdev_ops->xdo_dev_state_delete)) {
 447                 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
 448                 return;
 449         }
 450
 451         slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
 452 }
 453
 454 /**
 455  * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
 456  * @skb: current data packet
 457  * @xs: pointer to transformer state struct
 458  **/
 459 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 460 {
 461         struct net_device *bond_dev = xs->xso.dev;
 462         struct bonding *bond = netdev_priv(bond_dev);
 463         struct slave *curr_active = rcu_dereference(bond->curr_active_slave);
 464         struct net_device *slave_dev = curr_active->dev;
 465
 466         if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
 467                 return true;
 468
 469         if (!(slave_dev->xfrmdev_ops
 470               && slave_dev->xfrmdev_ops->xdo_dev_offload_ok)) {
 471                 slave_warn(bond_dev, slave_dev, "%s: no slave xdo_dev_offload_ok\n", __func__);
 472                 return false;
 473         }
 474
 475         xs->xso.real_dev = slave_dev;
 476         return slave_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
 477 }
 478
 479 static const struct xfrmdev_ops bond_xfrmdev_ops = {
 480         .xdo_dev_state_add = bond_ipsec_add_sa,
 481         .xdo_dev_state_delete = bond_ipsec_del_sa,
 482         .xdo_dev_offload_ok = bond_ipsec_offload_ok,
 483 };
 484 #endif /* CONFIG_XFRM_OFFLOAD */
 485
 486 /*------------------------------- Link status -------------------------------*/
 487
 488 /* Set the carrier state for the master according to the state of its
 489  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 490  * do special 802.3ad magic.
 491  *
 492  * Returns zero if carrier state does not change, nonzero if it does.
 493  */
 494 int bond_set_carrier(struct bonding *bond)
 495 {
 496         struct list_head *iter;
 497         struct slave *slave;
 498
 499         if (!bond_has_slaves(bond))
 500                 goto down;
 501
 502         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 503                 return bond_3ad_set_carrier(bond);
 504
 505         bond_for_each_slave(bond, slave, iter) {
 506                 if (slave->link == BOND_LINK_UP) {
 507                         if (!netif_carrier_ok(bond->dev)) {
 508                                 netif_carrier_on(bond->dev);
 509                                 return 1;
 510                         }
 511                         return 0;
 512                 }
 513         }
 514
 515 down:
 516         if (netif_carrier_ok(bond->dev)) {
 517                 netif_carrier_off(bond->dev);
 518                 return 1;
 519         }
 520         return 0;
 521 }
 522
 523 /* Get link speed and duplex from the slave's base driver
 524  * using ethtool. If for some reason the call fails or the
 525  * values are invalid, set speed and duplex to -1,
 526  * and return. Return 1 if speed or duplex settings are
 527  * UNKNOWN; 0 otherwise.
 528  */
 529 static int bond_update_speed_duplex(struct slave *slave)
 530 {
 531         struct net_device *slave_dev = slave->dev;
 532         struct ethtool_link_ksettings ecmd;
 533         int res;
 534
 535         slave->speed = SPEED_UNKNOWN;
 536         slave->duplex = DUPLEX_UNKNOWN;
 537
 538         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 539         if (res < 0)
 540                 return 1;
 541         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 542                 return 1;
 543         switch (ecmd.base.duplex) {
 544         case DUPLEX_FULL:
 545         case DUPLEX_HALF:
 546                 break;
 547         default:
 548                 return 1;
 549         }
 550
 551         slave->speed = ecmd.base.speed;
 552         slave->duplex = ecmd.base.duplex;
 553
 554         return 0;
 555 }
 556
 557 const char *bond_slave_link_status(s8 link)
 558 {
 559         switch (link) {
 560         case BOND_LINK_UP:
 561                 return "up";
 562         case BOND_LINK_FAIL:
 563                 return "going down";
 564         case BOND_LINK_DOWN:
 565                 return "down";
 566         case BOND_LINK_BACK:
 567                 return "going back";
 568         default:
 569                 return "unknown";
 570         }
 571 }
 572
 573 /* if <dev> supports MII link status reporting, check its link status.
 574  *
 575  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 576  * depending upon the setting of the use_carrier parameter.
 577  *
 578  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 579  * can't tell and just pretend it is), or 0, meaning that the link is
 580  * down.
 581  *
 582  * If reporting is non-zero, instead of faking link up, return -1 if
 583  * both ETHTOOL and MII ioctls fail (meaning the device does not
 584  * support them).  If use_carrier is set, return whatever it says.
 585  * It'd be nice if there was a good way to tell if a driver supports
 586  * netif_carrier, but there really isn't.
 587  */
 588 static int bond_check_dev_link(struct bonding *bond,
 589                                struct net_device *slave_dev, int reporting)
 590 {
 591         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 592         int (*ioctl)(struct net_device *, struct ifreq *, int);
 593         struct ifreq ifr;
 594         struct mii_ioctl_data *mii;
 595
 596         if (!reporting && !netif_running(slave_dev))
 597                 return 0;
 598
 599         if (bond->params.use_carrier)
 600                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 601
 602         /* Try to get link status using Ethtool first. */
 603         if (slave_dev->ethtool_ops->get_link)
 604                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 605                         BMSR_LSTATUS : 0;
 606
 607         /* Ethtool can't be used, fallback to MII ioctls. */
 608         ioctl = slave_ops->ndo_do_ioctl;
 609         if (ioctl) {
 610                 /* TODO: set pointer to correct ioctl on a per team member
 611                  *       bases to make this more efficient. that is, once
 612                  *       we determine the correct ioctl, we will always
 613                  *       call it and not the others for that team
 614                  *       member.
 615                  */
 616
 617                 /* We cannot assume that SIOCGMIIPHY will also read a
 618                  * register; not all network drivers (e.g., e100)
 619                  * support that.
 620                  */
 621
 622                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 623                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 624                 mii = if_mii(&ifr);
 625                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 626                         mii->reg_num = MII_BMSR;
 627                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 628                                 return mii->val_out & BMSR_LSTATUS;
 629                 }
 630         }
 631
 632         /* If reporting, report that either there's no dev->do_ioctl,
 633          * or both SIOCGMIIREG and get_link failed (meaning that we
 634          * cannot report link status).  If not reporting, pretend
 635          * we're ok.
 636          */
 637         return reporting ? -1 : BMSR_LSTATUS;
 638 }
 639
 640 /*----------------------------- Multicast list ------------------------------*/
 641
 642 /* Push the promiscuity flag down to appropriate slaves */
 643 static int bond_set_promiscuity(struct bonding *bond, int inc)
 644 {
 645         struct list_head *iter;
 646         int err = 0;
 647
 648         if (bond_uses_primary(bond)) {
 649                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 650
 651                 if (curr_active)
 652                         err = dev_set_promiscuity(curr_active->dev, inc);
 653         } else {
 654                 struct slave *slave;
 655
 656                 bond_for_each_slave(bond, slave, iter) {
 657                         err = dev_set_promiscuity(slave->dev, inc);
 658                         if (err)
 659                                 return err;
 660                 }
 661         }
 662         return err;
 663 }
 664
 665 /* Push the allmulti flag down to all slaves */
 666 static int bond_set_allmulti(struct bonding *bond, int inc)
 667 {
 668         struct list_head *iter;
 669         int err = 0;
 670
 671         if (bond_uses_primary(bond)) {
 672                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 673
 674                 if (curr_active)
 675                         err = dev_set_allmulti(curr_active->dev, inc);
 676         } else {
 677                 struct slave *slave;
 678
 679                 bond_for_each_slave(bond, slave, iter) {
 680                         err = dev_set_allmulti(slave->dev, inc);
 681                         if (err)
 682                                 return err;
 683                 }
 684         }
 685         return err;
 686 }
 687
 688 /* Retrieve the list of registered multicast addresses for the bonding
 689  * device and retransmit an IGMP JOIN request to the current active
 690  * slave.
 691  */
 692 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 693 {
 694         struct bonding *bond = container_of(work, struct bonding,
 695                                             mcast_work.work);
 696
 697         if (!rtnl_trylock()) {
 698                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 699                 return;
 700         }
 701         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 702
 703         if (bond->igmp_retrans > 1) {
 704                 bond->igmp_retrans--;
 705                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 706         }
 707         rtnl_unlock();
 708 }
 709
 710 /* Flush bond's hardware addresses from slave */
 711 static void bond_hw_addr_flush(struct net_device *bond_dev,
 712                                struct net_device *slave_dev)
 713 {
 714         struct bonding *bond = netdev_priv(bond_dev);
 715
 716         dev_uc_unsync(slave_dev, bond_dev);
 717         dev_mc_unsync(slave_dev, bond_dev);
 718
 719         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 720                 /* del lacpdu mc addr from mc list */
 721                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 722
 723                 dev_mc_del(slave_dev, lacpdu_multicast);
 724         }
 725 }
 726
 727 /*--------------------------- Active slave change ---------------------------*/
 728
 729 /* Update the hardware address list and promisc/allmulti for the new and
 730  * old active slaves (if any).  Modes that are not using primary keep all
 731  * slaves up date at all times; only the modes that use primary need to call
 732  * this function to swap these settings during a failover.
 733  */
 734 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 735                               struct slave *old_active)
 736 {
 737         if (old_active) {
 738                 if (bond->dev->flags & IFF_PROMISC)
 739                         dev_set_promiscuity(old_active->dev, -1);
 740
 741                 if (bond->dev->flags & IFF_ALLMULTI)
 742                         dev_set_allmulti(old_active->dev, -1);
 743
 744                 bond_hw_addr_flush(bond->dev, old_active->dev);
 745         }
 746
 747         if (new_active) {
 748                 /* FIXME: Signal errors upstream. */
 749                 if (bond->dev->flags & IFF_PROMISC)
 750                         dev_set_promiscuity(new_active->dev, 1);
 751
 752                 if (bond->dev->flags & IFF_ALLMULTI)
 753                         dev_set_allmulti(new_active->dev, 1);
 754
 755                 netif_addr_lock_bh(bond->dev);
 756                 dev_uc_sync(new_active->dev, bond->dev);
 757                 dev_mc_sync(new_active->dev, bond->dev);
 758                 netif_addr_unlock_bh(bond->dev);
 759         }
 760 }
 761
 762 /**
 763  * bond_set_dev_addr - clone slave's address to bond
 764  * @bond_dev: bond net device
 765  * @slave_dev: slave net device
 766  *
 767  * Should be called with RTNL held.
 768  */
 769 static int bond_set_dev_addr(struct net_device *bond_dev,
 770                              struct net_device *slave_dev)
 771 {
 772         int err;
 773
 774         slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 775                   bond_dev, slave_dev, slave_dev->addr_len);
 776         err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 777         if (err)
 778                 return err;
 779
 780         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 781         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 782         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 783         return 0;
 784 }
 785
 786 static struct slave *bond_get_old_active(struct bonding *bond,
 787                                          struct slave *new_active)
 788 {
 789         struct slave *slave;
 790         struct list_head *iter;
 791
 792         bond_for_each_slave(bond, slave, iter) {
 793                 if (slave == new_active)
 794                         continue;
 795
 796                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 797                         return slave;
 798         }
 799
 800         return NULL;
 801 }
 802
 803 /* bond_do_fail_over_mac
 804  *
 805  * Perform special MAC address swapping for fail_over_mac settings
 806  *
 807  * Called with RTNL
 808  */
 809 static void bond_do_fail_over_mac(struct bonding *bond,
 810                                   struct slave *new_active,
 811                                   struct slave *old_active)
 812 {
 813         u8 tmp_mac[MAX_ADDR_LEN];
 814         struct sockaddr_storage ss;
 815         int rv;
 816
 817         switch (bond->params.fail_over_mac) {
 818         case BOND_FOM_ACTIVE:
 819                 if (new_active) {
 820                         rv = bond_set_dev_addr(bond->dev, new_active->dev);
 821                         if (rv)
 822                                 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 823                                           -rv);
 824                 }
 825                 break;
 826         case BOND_FOM_FOLLOW:
 827                 /* if new_active && old_active, swap them
 828                  * if just old_active, do nothing (going to no active slave)
 829                  * if just new_active, set new_active to bond's MAC
 830                  */
 831                 if (!new_active)
 832                         return;
 833
 834                 if (!old_active)
 835                         old_active = bond_get_old_active(bond, new_active);
 836
 837                 if (old_active) {
 838                         bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 839                                           new_active->dev->addr_len);
 840                         bond_hw_addr_copy(ss.__data,
 841                                           old_active->dev->dev_addr,
 842                                           old_active->dev->addr_len);
 843                         ss.ss_family = new_active->dev->type;
 844                 } else {
 845                         bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 846                                           bond->dev->addr_len);
 847                         ss.ss_family = bond->dev->type;
 848                 }
 849
 850                 rv = dev_set_mac_address(new_active->dev,
 851                                          (struct sockaddr *)&ss, NULL);
 852                 if (rv) {
 853                         slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
 854                                   -rv);
 855                         goto out;
 856                 }
 857
 858                 if (!old_active)
 859                         goto out;
 860
 861                 bond_hw_addr_copy(ss.__data, tmp_mac,
 862                                   new_active->dev->addr_len);
 863                 ss.ss_family = old_active->dev->type;
 864
 865                 rv = dev_set_mac_address(old_active->dev,
 866                                          (struct sockaddr *)&ss, NULL);
 867                 if (rv)
 868                         slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
 869                                   -rv);
 870 out:
 871                 break;
 872         default:
 873                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 874                            bond->params.fail_over_mac);
 875                 break;
 876         }
 877
 878 }
 879
 880 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 881 {
 882         struct slave *prim = rtnl_dereference(bond->primary_slave);
 883         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 884
 885         if (!prim || prim->link != BOND_LINK_UP) {
 886                 if (!curr || curr->link != BOND_LINK_UP)
 887                         return NULL;
 888                 return curr;
 889         }
 890
 891         if (bond->force_primary) {
 892                 bond->force_primary = false;
 893                 return prim;
 894         }
 895
 896         if (!curr || curr->link != BOND_LINK_UP)
 897                 return prim;
 898
 899         /* At this point, prim and curr are both up */
 900         switch (bond->params.primary_reselect) {
 901         case BOND_PRI_RESELECT_ALWAYS:
 902                 return prim;
 903         case BOND_PRI_RESELECT_BETTER:
 904                 if (prim->speed < curr->speed)
 905                         return curr;
 906                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
 907                         return curr;
 908                 return prim;
 909         case BOND_PRI_RESELECT_FAILURE:
 910                 return curr;
 911         default:
 912                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
 913                            bond->params.primary_reselect);
 914                 return curr;
 915         }
 916 }
 917
 918 /**
 919  * bond_find_best_slave - select the best available slave to be the active one
 920  * @bond: our bonding struct
 921  */
 922 static struct slave *bond_find_best_slave(struct bonding *bond)
 923 {
 924         struct slave *slave, *bestslave = NULL;
 925         struct list_head *iter;
 926         int mintime = bond->params.updelay;
 927
 928         slave = bond_choose_primary_or_current(bond);
 929         if (slave)
 930                 return slave;
 931
 932         bond_for_each_slave(bond, slave, iter) {
 933                 if (slave->link == BOND_LINK_UP)
 934                         return slave;
 935                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 936                     slave->delay < mintime) {
 937                         mintime = slave->delay;
 938                         bestslave = slave;
 939                 }
 940         }
 941
 942         return bestslave;
 943 }
 944
 945 static bool bond_should_notify_peers(struct bonding *bond)
 946 {
 947         struct slave *slave;
 948
 949         rcu_read_lock();
 950         slave = rcu_dereference(bond->curr_active_slave);
 951         rcu_read_unlock();
 952
 953         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 954                    slave ? slave->dev->name : "NULL");
 955
 956         if (!slave || !bond->send_peer_notif ||
 957             bond->send_peer_notif %
 958             max(1, bond->params.peer_notif_delay) != 0 ||
 959             !netif_carrier_ok(bond->dev) ||
 960             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 961                 return false;
 962
 963         return true;
 964 }
 965
 966 /**
 967  * bond_change_active_slave - change the active slave into the specified one
 968  * @bond: our bonding struct
 969  * @new_active: the new slave to make the active one
 970  *
 971  * Set the new slave to the bond's settings and unset them on the old
 972  * curr_active_slave.
 973  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 974  *
 975  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 976  * because it is apparently the best available slave we have, even though its
 977  * updelay hasn't timed out yet.
 978  *
 979  * Caller must hold RTNL.
 980  */
 981 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 982 {
 983         struct slave *old_active;
 984
 985         ASSERT_RTNL();
 986
 987         old_active = rtnl_dereference(bond->curr_active_slave);
 988
 989         if (old_active == new_active)
 990                 return;
 991
 992 #ifdef CONFIG_XFRM_OFFLOAD
 993         if (old_active && bond->xs)
 994                 bond_ipsec_del_sa(bond->xs);
 995 #endif /* CONFIG_XFRM_OFFLOAD */
 996
 997         if (new_active) {
 998                 new_active->last_link_up = jiffies;
 999
1000                 if (new_active->link == BOND_LINK_BACK) {
1001                         if (bond_uses_primary(bond)) {
1002                                 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
1003                                            (bond->params.updelay - new_active->delay) * bond->params.miimon);
1004                         }
1005
1006                         new_active->delay = 0;
1007                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
1008                                                   BOND_SLAVE_NOTIFY_NOW);
1009
1010                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1011                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1012
1013                         if (bond_is_lb(bond))
1014                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1015                 } else {
1016                         if (bond_uses_primary(bond)) {
1017                                 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1018                         }
1019                 }
1020         }
1021
1022         if (bond_uses_primary(bond))
1023                 bond_hw_addr_swap(bond, new_active, old_active);
1024
1025         if (bond_is_lb(bond)) {
1026                 bond_alb_handle_active_change(bond, new_active);
1027                 if (old_active)
1028                         bond_set_slave_inactive_flags(old_active,
1029                                                       BOND_SLAVE_NOTIFY_NOW);
1030                 if (new_active)
1031                         bond_set_slave_active_flags(new_active,
1032                                                     BOND_SLAVE_NOTIFY_NOW);
1033         } else {
1034                 rcu_assign_pointer(bond->curr_active_slave, new_active);
1035         }
1036
1037         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1038                 if (old_active)
1039                         bond_set_slave_inactive_flags(old_active,
1040                                                       BOND_SLAVE_NOTIFY_NOW);
1041
1042                 if (new_active) {
1043                         bool should_notify_peers = false;
1044
1045                         bond_set_slave_active_flags(new_active,
1046                                                     BOND_SLAVE_NOTIFY_NOW);
1047
1048                         if (bond->params.fail_over_mac)
1049                                 bond_do_fail_over_mac(bond, new_active,
1050                                                       old_active);
1051
1052                         if (netif_running(bond->dev)) {
1053                                 bond->send_peer_notif =
1054                                         bond->params.num_peer_notif *
1055                                         max(1, bond->params.peer_notif_delay);
1056                                 should_notify_peers =
1057                                         bond_should_notify_peers(bond);
1058                         }
1059
1060                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1061                         if (should_notify_peers) {
1062                                 bond->send_peer_notif--;
1063                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1064                                                          bond->dev);
1065                         }
1066                 }
1067         }
1068
1069 #ifdef CONFIG_XFRM_OFFLOAD
1070         if (new_active && bond->xs) {
1071                 xfrm_dev_state_flush(dev_net(bond->dev), bond->dev, true);
1072                 bond_ipsec_add_sa(bond->xs);
1073         }
1074 #endif /* CONFIG_XFRM_OFFLOAD */
1075
1076         /* resend IGMP joins since active slave has changed or
1077          * all were sent on curr_active_slave.
1078          * resend only if bond is brought up with the affected
1079          * bonding modes and the retransmission is enabled
1080          */
1081         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1082             ((bond_uses_primary(bond) && new_active) ||
1083              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1084                 bond->igmp_retrans = bond->params.resend_igmp;
1085                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1086         }
1087 }
1088
1089 /**
1090  * bond_select_active_slave - select a new active slave, if needed
1091  * @bond: our bonding struct
1092  *
1093  * This functions should be called when one of the following occurs:
1094  * - The old curr_active_slave has been released or lost its link.
1095  * - The primary_slave has got its link back.
1096  * - A slave has got its link back and there's no old curr_active_slave.
1097  *
1098  * Caller must hold RTNL.
1099  */
1100 void bond_select_active_slave(struct bonding *bond)
1101 {
1102         struct slave *best_slave;
1103         int rv;
1104
1105         ASSERT_RTNL();
1106
1107         best_slave = bond_find_best_slave(bond);
1108         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1109                 bond_change_active_slave(bond, best_slave);
1110                 rv = bond_set_carrier(bond);
1111                 if (!rv)
1112                         return;
1113
1114                 if (netif_carrier_ok(bond->dev))
1115                         netdev_info(bond->dev, "active interface up!\n");
1116                 else
1117                         netdev_info(bond->dev, "now running without any active interface!\n");
1118         }
1119 }
1120
1121 #ifdef CONFIG_NET_POLL_CONTROLLER
1122 static inline int slave_enable_netpoll(struct slave *slave)
1123 {
1124         struct netpoll *np;
1125         int err = 0;
1126
1127         np = kzalloc(sizeof(*np), GFP_KERNEL);
1128         err = -ENOMEM;
1129         if (!np)
1130                 goto out;
1131
1132         err = __netpoll_setup(np, slave->dev);
1133         if (err) {
1134                 kfree(np);
1135                 goto out;
1136         }
1137         slave->np = np;
1138 out:
1139         return err;
1140 }
1141 static inline void slave_disable_netpoll(struct slave *slave)
1142 {
1143         struct netpoll *np = slave->np;
1144
1145         if (!np)
1146                 return;
1147
1148         slave->np = NULL;
1149
1150         __netpoll_free(np);
1151 }
1152
1153 static void bond_poll_controller(struct net_device *bond_dev)
1154 {
1155         struct bonding *bond = netdev_priv(bond_dev);
1156         struct slave *slave = NULL;
1157         struct list_head *iter;
1158         struct ad_info ad_info;
1159
1160         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1161                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1162                         return;
1163
1164         bond_for_each_slave_rcu(bond, slave, iter) {
1165                 if (!bond_slave_is_up(slave))
1166                         continue;
1167
1168                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1169                         struct aggregator *agg =
1170                             SLAVE_AD_INFO(slave)->port.aggregator;
1171
1172                         if (agg &&
1173                             agg->aggregator_identifier != ad_info.aggregator_id)
1174                                 continue;
1175                 }
1176
1177                 netpoll_poll_dev(slave->dev);
1178         }
1179 }
1180
1181 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1182 {
1183         struct bonding *bond = netdev_priv(bond_dev);
1184         struct list_head *iter;
1185         struct slave *slave;
1186
1187         bond_for_each_slave(bond, slave, iter)
1188                 if (bond_slave_is_up(slave))
1189                         slave_disable_netpoll(slave);
1190 }
1191
1192 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1193 {
1194         struct bonding *bond = netdev_priv(dev);
1195         struct list_head *iter;
1196         struct slave *slave;
1197         int err = 0;
1198
1199         bond_for_each_slave(bond, slave, iter) {
1200                 err = slave_enable_netpoll(slave);
1201                 if (err) {
1202                         bond_netpoll_cleanup(dev);
1203                         break;
1204                 }
1205         }
1206         return err;
1207 }
1208 #else
1209 static inline int slave_enable_netpoll(struct slave *slave)
1210 {
1211         return 0;
1212 }
1213 static inline void slave_disable_netpoll(struct slave *slave)
1214 {
1215 }
1216 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1217 {
1218 }
1219 #endif
1220
1221 /*---------------------------------- IOCTL ----------------------------------*/
1222
1223 static netdev_features_t bond_fix_features(struct net_device *dev,
1224                                            netdev_features_t features)
1225 {
1226         struct bonding *bond = netdev_priv(dev);
1227         struct list_head *iter;
1228         netdev_features_t mask;
1229         struct slave *slave;
1230
1231 #if IS_ENABLED(CONFIG_TLS_DEVICE)
1232         if (bond_sk_check(bond))
1233                 features |= BOND_TLS_FEATURES;
1234         else
1235                 features &= ~BOND_TLS_FEATURES;
1236 #endif
1237
1238         mask = features;
1239
1240         features &= ~NETIF_F_ONE_FOR_ALL;
1241         features |= NETIF_F_ALL_FOR_ALL;
1242
1243         bond_for_each_slave(bond, slave, iter) {
1244                 features = netdev_increment_features(features,
1245                                                      slave->dev->features,
1246                                                      mask);
1247         }
1248         features = netdev_add_tso_features(features, mask);
1249
1250         return features;
1251 }
1252
1253 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1254                                  NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \
1255                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1256
1257 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1258                                  NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE)
1259
1260 #define BOND_MPLS_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1261                                  NETIF_F_GSO_SOFTWARE)
1262
1263
1264 static void bond_compute_features(struct bonding *bond)
1265 {
1266         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1267                                         IFF_XMIT_DST_RELEASE_PERM;
1268         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1269         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1270 #ifdef CONFIG_XFRM_OFFLOAD
1271         netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
1272 #endif /* CONFIG_XFRM_OFFLOAD */
1273         netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1274         struct net_device *bond_dev = bond->dev;
1275         struct list_head *iter;
1276         struct slave *slave;
1277         unsigned short max_hard_header_len = ETH_HLEN;
1278         unsigned int gso_max_size = GSO_MAX_SIZE;
1279         u16 gso_max_segs = GSO_MAX_SEGS;
1280
1281         if (!bond_has_slaves(bond))
1282                 goto done;
1283         vlan_features &= NETIF_F_ALL_FOR_ALL;
1284         mpls_features &= NETIF_F_ALL_FOR_ALL;
1285
1286         bond_for_each_slave(bond, slave, iter) {
1287                 vlan_features = netdev_increment_features(vlan_features,
1288                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1289
1290                 enc_features = netdev_increment_features(enc_features,
1291                                                          slave->dev->hw_enc_features,
1292                                                          BOND_ENC_FEATURES);
1293
1294 #ifdef CONFIG_XFRM_OFFLOAD
1295                 xfrm_features = netdev_increment_features(xfrm_features,
1296                                                           slave->dev->hw_enc_features,
1297                                                           BOND_XFRM_FEATURES);
1298 #endif /* CONFIG_XFRM_OFFLOAD */
1299
1300                 mpls_features = netdev_increment_features(mpls_features,
1301                                                           slave->dev->mpls_features,
1302                                                           BOND_MPLS_FEATURES);
1303
1304                 dst_release_flag &= slave->dev->priv_flags;
1305                 if (slave->dev->hard_header_len > max_hard_header_len)
1306                         max_hard_header_len = slave->dev->hard_header_len;
1307
1308                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1309                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1310         }
1311         bond_dev->hard_header_len = max_hard_header_len;
1312
1313 done:
1314         bond_dev->vlan_features = vlan_features;
1315         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1316                                     NETIF_F_HW_VLAN_CTAG_TX |
1317                                     NETIF_F_HW_VLAN_STAG_TX;
1318 #ifdef CONFIG_XFRM_OFFLOAD
1319         bond_dev->hw_enc_features |= xfrm_features;
1320 #endif /* CONFIG_XFRM_OFFLOAD */
1321         bond_dev->mpls_features = mpls_features;
1322         bond_dev->gso_max_segs = gso_max_segs;
1323         netif_set_gso_max_size(bond_dev, gso_max_size);
1324
1325         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1326         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1327             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1328                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1329
1330         netdev_change_features(bond_dev);
1331 }
1332
1333 static void bond_setup_by_slave(struct net_device *bond_dev,
1334                                 struct net_device *slave_dev)
1335 {
1336         bond_dev->header_ops        = slave_dev->header_ops;
1337
1338         bond_dev->type              = slave_dev->type;
1339         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1340         bond_dev->needed_headroom   = slave_dev->needed_headroom;
1341         bond_dev->addr_len          = slave_dev->addr_len;
1342
1343         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1344                 slave_dev->addr_len);
1345 }
1346
1347 /* On bonding slaves other than the currently active slave, suppress
1348  * duplicates except for alb non-mcast/bcast.
1349  */
1350 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1351                                             struct slave *slave,
1352                                             struct bonding *bond)
1353 {
1354         if (bond_is_slave_inactive(slave)) {
1355                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1356                     skb->pkt_type != PACKET_BROADCAST &&
1357                     skb->pkt_type != PACKET_MULTICAST)
1358                         return false;
1359                 return true;
1360         }
1361         return false;
1362 }
1363
1364 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1365 {
1366         struct sk_buff *skb = *pskb;
1367         struct slave *slave;
1368         struct bonding *bond;
1369         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1370                           struct slave *);
1371         int ret = RX_HANDLER_ANOTHER;
1372
1373         skb = skb_share_check(skb, GFP_ATOMIC);
1374         if (unlikely(!skb))
1375                 return RX_HANDLER_CONSUMED;
1376
1377         *pskb = skb;
1378
1379         slave = bond_slave_get_rcu(skb->dev);
1380         bond = slave->bond;
1381
1382         recv_probe = READ_ONCE(bond->recv_probe);
1383         if (recv_probe) {
1384                 ret = recv_probe(skb, bond, slave);
1385                 if (ret == RX_HANDLER_CONSUMED) {
1386                         consume_skb(skb);
1387                         return ret;
1388                 }
1389         }
1390
1391         /*
1392          * For packets determined by bond_should_deliver_exact_match() call to
1393          * be suppressed we want to make an exception for link-local packets.
1394          * This is necessary for e.g. LLDP daemons to be able to monitor
1395          * inactive slave links without being forced to bind to them
1396          * explicitly.
1397          *
1398          * At the same time, packets that are passed to the bonding master
1399          * (including link-local ones) can have their originating interface
1400          * determined via PACKET_ORIGDEV socket option.
1401          */
1402         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1403                 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1404                         return RX_HANDLER_PASS;
1405                 return RX_HANDLER_EXACT;
1406         }
1407
1408         skb->dev = bond->dev;
1409
1410         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1411             netif_is_bridge_port(bond->dev) &&
1412             skb->pkt_type == PACKET_HOST) {
1413
1414                 if (unlikely(skb_cow_head(skb,
1415                                           skb->data - skb_mac_header(skb)))) {
1416                         kfree_skb(skb);
1417                         return RX_HANDLER_CONSUMED;
1418                 }
1419                 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1420                                   bond->dev->addr_len);
1421         }
1422
1423         return ret;
1424 }
1425
1426 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1427 {
1428         switch (BOND_MODE(bond)) {
1429         case BOND_MODE_ROUNDROBIN:
1430                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1431         case BOND_MODE_ACTIVEBACKUP:
1432                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1433         case BOND_MODE_BROADCAST:
1434                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1435         case BOND_MODE_XOR:
1436         case BOND_MODE_8023AD:
1437                 return NETDEV_LAG_TX_TYPE_HASH;
1438         default:
1439                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1440         }
1441 }
1442
1443 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1444                                                enum netdev_lag_tx_type type)
1445 {
1446         if (type != NETDEV_LAG_TX_TYPE_HASH)
1447                 return NETDEV_LAG_HASH_NONE;
1448
1449         switch (bond->params.xmit_policy) {
1450         case BOND_XMIT_POLICY_LAYER2:
1451                 return NETDEV_LAG_HASH_L2;
1452         case BOND_XMIT_POLICY_LAYER34:
1453                 return NETDEV_LAG_HASH_L34;
1454         case BOND_XMIT_POLICY_LAYER23:
1455                 return NETDEV_LAG_HASH_L23;
1456         case BOND_XMIT_POLICY_ENCAP23:
1457                 return NETDEV_LAG_HASH_E23;
1458         case BOND_XMIT_POLICY_ENCAP34:
1459                 return NETDEV_LAG_HASH_E34;
1460         case BOND_XMIT_POLICY_VLAN_SRCMAC:
1461                 return NETDEV_LAG_HASH_VLAN_SRCMAC;
1462         default:
1463                 return NETDEV_LAG_HASH_UNKNOWN;
1464         }
1465 }
1466
1467 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1468                                       struct netlink_ext_ack *extack)
1469 {
1470         struct netdev_lag_upper_info lag_upper_info;
1471         enum netdev_lag_tx_type type;
1472
1473         type = bond_lag_tx_type(bond);
1474         lag_upper_info.tx_type = type;
1475         lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1476
1477         return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1478                                             &lag_upper_info, extack);
1479 }
1480
1481 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1482 {
1483         netdev_upper_dev_unlink(slave->dev, bond->dev);
1484         slave->dev->flags &= ~IFF_SLAVE;
1485 }
1486
1487 static void slave_kobj_release(struct kobject *kobj)
1488 {
1489         struct slave *slave = to_slave(kobj);
1490         struct bonding *bond = bond_get_bond_by_slave(slave);
1491
1492         cancel_delayed_work_sync(&slave->notify_work);
1493         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1494                 kfree(SLAVE_AD_INFO(slave));
1495
1496         kfree(slave);
1497 }
1498
1499 static struct kobj_type slave_ktype = {
1500         .release = slave_kobj_release,
1501 #ifdef CONFIG_SYSFS
1502         .sysfs_ops = &slave_sysfs_ops,
1503 #endif
1504 };
1505
1506 static int bond_kobj_init(struct slave *slave)
1507 {
1508         int err;
1509
1510         err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1511                                    &(slave->dev->dev.kobj), "bonding_slave");
1512         if (err)
1513                 kobject_put(&slave->kobj);
1514
1515         return err;
1516 }
1517
1518 static struct slave *bond_alloc_slave(struct bonding *bond,
1519                                       struct net_device *slave_dev)
1520 {
1521         struct slave *slave = NULL;
1522
1523         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1524         if (!slave)
1525                 return NULL;
1526
1527         slave->bond = bond;
1528         slave->dev = slave_dev;
1529
1530         if (bond_kobj_init(slave))
1531                 return NULL;
1532
1533         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1534                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1535                                                GFP_KERNEL);
1536                 if (!SLAVE_AD_INFO(slave)) {
1537                         kobject_put(&slave->kobj);
1538                         return NULL;
1539                 }
1540         }
1541         INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1542
1543         return slave;
1544 }
1545
1546 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1547 {
1548         info->bond_mode = BOND_MODE(bond);
1549         info->miimon = bond->params.miimon;
1550         info->num_slaves = bond->slave_cnt;
1551 }
1552
1553 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1554 {
1555         strcpy(info->slave_name, slave->dev->name);
1556         info->link = slave->link;
1557         info->state = bond_slave_state(slave);
1558         info->link_failure_count = slave->link_failure_count;
1559 }
1560
1561 static void bond_netdev_notify_work(struct work_struct *_work)
1562 {
1563         struct slave *slave = container_of(_work, struct slave,
1564                                            notify_work.work);
1565
1566         if (rtnl_trylock()) {
1567                 struct netdev_bonding_info binfo;
1568
1569                 bond_fill_ifslave(slave, &binfo.slave);
1570                 bond_fill_ifbond(slave->bond, &binfo.master);
1571                 netdev_bonding_info_change(slave->dev, &binfo);
1572                 rtnl_unlock();
1573         } else {
1574                 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1575         }
1576 }
1577
1578 void bond_queue_slave_event(struct slave *slave)
1579 {
1580         queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1581 }
1582
1583 void bond_lower_state_changed(struct slave *slave)
1584 {
1585         struct netdev_lag_lower_state_info info;
1586
1587         info.link_up = slave->link == BOND_LINK_UP ||
1588                        slave->link == BOND_LINK_FAIL;
1589         info.tx_enabled = bond_is_active_slave(slave);
1590         netdev_lower_state_changed(slave->dev, &info);
1591 }
1592
1593 /* enslave device <slave> to bond device <master> */
1594 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1595                  struct netlink_ext_ack *extack)
1596 {
1597         struct bonding *bond = netdev_priv(bond_dev);
1598         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1599         struct slave *new_slave = NULL, *prev_slave;
1600         struct sockaddr_storage ss;
1601         int link_reporting;
1602         int res = 0, i;
1603
1604         if (!bond->params.use_carrier &&
1605             slave_dev->ethtool_ops->get_link == NULL &&
1606             slave_ops->ndo_do_ioctl == NULL) {
1607                 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1608         }
1609
1610         /* already in-use? */
1611         if (netdev_is_rx_handler_busy(slave_dev)) {
1612                 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1613                 slave_err(bond_dev, slave_dev,
1614                           "Error: Device is in use and cannot be enslaved\n");
1615                 return -EBUSY;
1616         }
1617
1618         if (bond_dev == slave_dev) {
1619                 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1620                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1621                 return -EPERM;
1622         }
1623
1624         /* vlan challenged mutual exclusion */
1625         /* no need to lock since we're protected by rtnl_lock */
1626         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1627                 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1628                 if (vlan_uses_dev(bond_dev)) {
1629                         NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1630                         slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1631                         return -EPERM;
1632                 } else {
1633                         slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1634                 }
1635         } else {
1636                 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1637         }
1638
1639         if (slave_dev->features & NETIF_F_HW_ESP)
1640                 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1641
1642         /* Old ifenslave binaries are no longer supported.  These can
1643          * be identified with moderate accuracy by the state of the slave:
1644          * the current ifenslave will set the interface down prior to
1645          * enslaving it; the old ifenslave will not.
1646          */
1647         if (slave_dev->flags & IFF_UP) {
1648                 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1649                 slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1650                 return -EPERM;
1651         }
1652
1653         /* set bonding device ether type by slave - bonding netdevices are
1654          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1655          * there is a need to override some of the type dependent attribs/funcs.
1656          *
1657          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1658          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1659          */
1660         if (!bond_has_slaves(bond)) {
1661                 if (bond_dev->type != slave_dev->type) {
1662                         slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1663                                   bond_dev->type, slave_dev->type);
1664
1665                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1666                                                        bond_dev);
1667                         res = notifier_to_errno(res);
1668                         if (res) {
1669                                 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1670                                 return -EBUSY;
1671                         }
1672
1673                         /* Flush unicast and multicast addresses */
1674                         dev_uc_flush(bond_dev);
1675                         dev_mc_flush(bond_dev);
1676
1677                         if (slave_dev->type != ARPHRD_ETHER)
1678                                 bond_setup_by_slave(bond_dev, slave_dev);
1679                         else {
1680                                 ether_setup(bond_dev);
1681                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1682                         }
1683
1684                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1685                                                  bond_dev);
1686                 }
1687         } else if (bond_dev->type != slave_dev->type) {
1688                 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1689                 slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1690                           slave_dev->type, bond_dev->type);
1691                 return -EINVAL;
1692         }
1693
1694         if (slave_dev->type == ARPHRD_INFINIBAND &&
1695             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1696                 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1697                 slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1698                            slave_dev->type);
1699                 res = -EOPNOTSUPP;
1700                 goto err_undo_flags;
1701         }
1702
1703         if (!slave_ops->ndo_set_mac_address ||
1704             slave_dev->type == ARPHRD_INFINIBAND) {
1705                 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1706                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1707                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1708                         if (!bond_has_slaves(bond)) {
1709                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1710                                 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1711                         } else {
1712                                 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1713                                 slave_err(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1714                                 res = -EOPNOTSUPP;
1715                                 goto err_undo_flags;
1716                         }
1717                 }
1718         }
1719
1720         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1721
1722         /* If this is the first slave, then we need to set the master's hardware
1723          * address to be the same as the slave's.
1724          */
1725         if (!bond_has_slaves(bond) &&
1726             bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1727                 res = bond_set_dev_addr(bond->dev, slave_dev);
1728                 if (res)
1729                         goto err_undo_flags;
1730         }
1731
1732         new_slave = bond_alloc_slave(bond, slave_dev);
1733         if (!new_slave) {
1734                 res = -ENOMEM;
1735                 goto err_undo_flags;
1736         }
1737
1738         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1739          * is set via sysfs or module option if desired.
1740          */
1741         new_slave->queue_id = 0;
1742
1743         /* Save slave's original mtu and then set it to match the bond */
1744         new_slave->original_mtu = slave_dev->mtu;
1745         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1746         if (res) {
1747                 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1748                 goto err_free;
1749         }
1750
1751         /* Save slave's original ("permanent") mac address for modes
1752          * that need it, and for restoring it upon release, and then
1753          * set it to the master's address
1754          */
1755         bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1756                           slave_dev->addr_len);
1757
1758         if (!bond->params.fail_over_mac ||
1759             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1760                 /* Set slave to master's mac address.  The application already
1761                  * set the master's mac address to that of the first slave
1762                  */
1763                 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1764                 ss.ss_family = slave_dev->type;
1765                 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1766                                           extack);
1767                 if (res) {
1768                         slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1769                         goto err_restore_mtu;
1770                 }
1771         }
1772
1773         /* set slave flag before open to prevent IPv6 addrconf */
1774         slave_dev->flags |= IFF_SLAVE;
1775
1776         /* open the slave since the application closed it */
1777         res = dev_open(slave_dev, extack);
1778         if (res) {
1779                 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1780                 goto err_restore_mac;
1781         }
1782
1783         slave_dev->priv_flags |= IFF_BONDING;
1784         /* initialize slave stats */
1785         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1786
1787         if (bond_is_lb(bond)) {
1788                 /* bond_alb_init_slave() must be called before all other stages since
1789                  * it might fail and we do not want to have to undo everything
1790                  */
1791                 res = bond_alb_init_slave(bond, new_slave);
1792                 if (res)
1793                         goto err_close;
1794         }
1795
1796         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1797         if (res) {
1798                 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1799                 goto err_close;
1800         }
1801
1802         prev_slave = bond_last_slave(bond);
1803
1804         new_slave->delay = 0;
1805         new_slave->link_failure_count = 0;
1806
1807         if (bond_update_speed_duplex(new_slave) &&
1808             bond_needs_speed_duplex(bond))
1809                 new_slave->link = BOND_LINK_DOWN;
1810
1811         new_slave->last_rx = jiffies -
1812                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1813         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1814                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1815
1816         if (bond->params.miimon && !bond->params.use_carrier) {
1817                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1818
1819                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1820                         /* miimon is set but a bonded network driver
1821                          * does not support ETHTOOL/MII and
1822                          * arp_interval is not set.  Note: if
1823                          * use_carrier is enabled, we will never go
1824                          * here (because netif_carrier is always
1825                          * supported); thus, we don't need to change
1826                          * the messages for netif_carrier.
1827                          */
1828                         slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n");
1829                 } else if (link_reporting == -1) {
1830                         /* unable get link status using mii/ethtool */
1831                         slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n");
1832                 }
1833         }
1834
1835         /* check for initial state */
1836         new_slave->link = BOND_LINK_NOCHANGE;
1837         if (bond->params.miimon) {
1838                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1839                         if (bond->params.updelay) {
1840                                 bond_set_slave_link_state(new_slave,
1841                                                           BOND_LINK_BACK,
1842                                                           BOND_SLAVE_NOTIFY_NOW);
1843                                 new_slave->delay = bond->params.updelay;
1844                         } else {
1845                                 bond_set_slave_link_state(new_slave,
1846                                                           BOND_LINK_UP,
1847                                                           BOND_SLAVE_NOTIFY_NOW);
1848                         }
1849                 } else {
1850                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1851                                                   BOND_SLAVE_NOTIFY_NOW);
1852                 }
1853         } else if (bond->params.arp_interval) {
1854                 bond_set_slave_link_state(new_slave,
1855                                           (netif_carrier_ok(slave_dev) ?
1856                                           BOND_LINK_UP : BOND_LINK_DOWN),
1857                                           BOND_SLAVE_NOTIFY_NOW);
1858         } else {
1859                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1860                                           BOND_SLAVE_NOTIFY_NOW);
1861         }
1862
1863         if (new_slave->link != BOND_LINK_DOWN)
1864                 new_slave->last_link_up = jiffies;
1865         slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1866                   new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1867                   (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1868
1869         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1870                 /* if there is a primary slave, remember it */
1871                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1872                         rcu_assign_pointer(bond->primary_slave, new_slave);
1873                         bond->force_primary = true;
1874                 }
1875         }
1876
1877         switch (BOND_MODE(bond)) {
1878         case BOND_MODE_ACTIVEBACKUP:
1879                 bond_set_slave_inactive_flags(new_slave,
1880                                               BOND_SLAVE_NOTIFY_NOW);
1881                 break;
1882         case BOND_MODE_8023AD:
1883                 /* in 802.3ad mode, the internal mechanism
1884                  * will activate the slaves in the selected
1885                  * aggregator
1886                  */
1887                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1888                 /* if this is the first slave */
1889                 if (!prev_slave) {
1890                         SLAVE_AD_INFO(new_slave)->id = 1;
1891                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1892                          * can be called only after the mac address of the bond is set
1893                          */
1894                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1895                 } else {
1896                         SLAVE_AD_INFO(new_slave)->id =
1897                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1898                 }
1899
1900                 bond_3ad_bind_slave(new_slave);
1901                 break;
1902         case BOND_MODE_TLB:
1903         case BOND_MODE_ALB:
1904                 bond_set_active_slave(new_slave);
1905                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1906                 break;
1907         default:
1908                 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1909
1910                 /* always active in trunk mode */
1911                 bond_set_active_slave(new_slave);
1912
1913                 /* In trunking mode there is little meaning to curr_active_slave
1914                  * anyway (it holds no special properties of the bond device),
1915                  * so we can change it without calling change_active_interface()
1916                  */
1917                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1918                     new_slave->link == BOND_LINK_UP)
1919                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1920
1921                 break;
1922         } /* switch(bond_mode) */
1923
1924 #ifdef CONFIG_NET_POLL_CONTROLLER
1925         if (bond->dev->npinfo) {
1926                 if (slave_enable_netpoll(new_slave)) {
1927                         slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1928                         res = -EBUSY;
1929                         goto err_detach;
1930                 }
1931         }
1932 #endif
1933
1934         if (!(bond_dev->features & NETIF_F_LRO))
1935                 dev_disable_lro(slave_dev);
1936
1937         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1938                                          new_slave);
1939         if (res) {
1940                 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1941                 goto err_detach;
1942         }
1943
1944         res = bond_master_upper_dev_link(bond, new_slave, extack);
1945         if (res) {
1946                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1947                 goto err_unregister;
1948         }
1949
1950         bond_lower_state_changed(new_slave);
1951
1952         res = bond_sysfs_slave_add(new_slave);
1953         if (res) {
1954                 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1955                 goto err_upper_unlink;
1956         }
1957
1958         /* If the mode uses primary, then the following is handled by
1959          * bond_change_active_slave().
1960          */
1961         if (!bond_uses_primary(bond)) {
1962                 /* set promiscuity level to new slave */
1963                 if (bond_dev->flags & IFF_PROMISC) {
1964                         res = dev_set_promiscuity(slave_dev, 1);
1965                         if (res)
1966                                 goto err_sysfs_del;
1967                 }
1968
1969                 /* set allmulti level to new slave */
1970                 if (bond_dev->flags & IFF_ALLMULTI) {
1971                         res = dev_set_allmulti(slave_dev, 1);
1972                         if (res) {
1973                                 if (bond_dev->flags & IFF_PROMISC)
1974                                         dev_set_promiscuity(slave_dev, -1);
1975                                 goto err_sysfs_del;
1976                         }
1977                 }
1978
1979                 netif_addr_lock_bh(bond_dev);
1980                 dev_mc_sync_multiple(slave_dev, bond_dev);
1981                 dev_uc_sync_multiple(slave_dev, bond_dev);
1982                 netif_addr_unlock_bh(bond_dev);
1983
1984                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1985                         /* add lacpdu mc addr to mc list */
1986                         u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1987
1988                         dev_mc_add(slave_dev, lacpdu_multicast);
1989                 }
1990         }
1991
1992         bond->slave_cnt++;
1993         bond_compute_features(bond);
1994         bond_set_carrier(bond);
1995
1996         if (bond_uses_primary(bond)) {
1997                 block_netpoll_tx();
1998                 bond_select_active_slave(bond);
1999                 unblock_netpoll_tx();
2000         }
2001
2002         if (bond_mode_can_use_xmit_hash(bond))
2003                 bond_update_slave_arr(bond, NULL);
2004
2005
2006         slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
2007                    bond_is_active_slave(new_slave) ? "an active" : "a backup",
2008                    new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
2009
2010         /* enslave is successful */
2011         bond_queue_slave_event(new_slave);
2012         return 0;
2013
2014 /* Undo stages on error */
2015 err_sysfs_del:
2016         bond_sysfs_slave_del(new_slave);
2017
2018 err_upper_unlink:
2019         bond_upper_dev_unlink(bond, new_slave);
2020
2021 err_unregister:
2022         netdev_rx_handler_unregister(slave_dev);
2023
2024 err_detach:
2025         vlan_vids_del_by_dev(slave_dev, bond_dev);
2026         if (rcu_access_pointer(bond->primary_slave) == new_slave)
2027                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2028         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2029                 block_netpoll_tx();
2030                 bond_change_active_slave(bond, NULL);
2031                 bond_select_active_slave(bond);
2032                 unblock_netpoll_tx();
2033         }
2034         /* either primary_slave or curr_active_slave might've changed */
2035         synchronize_rcu();
2036         slave_disable_netpoll(new_slave);
2037
2038 err_close:
2039         if (!netif_is_bond_master(slave_dev))
2040                 slave_dev->priv_flags &= ~IFF_BONDING;
2041         dev_close(slave_dev);
2042
2043 err_restore_mac:
2044         slave_dev->flags &= ~IFF_SLAVE;
2045         if (!bond->params.fail_over_mac ||
2046             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2047                 /* XXX TODO - fom follow mode needs to change master's
2048                  * MAC if this slave's MAC is in use by the bond, or at
2049                  * least print a warning.
2050                  */
2051                 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2052                                   new_slave->dev->addr_len);
2053                 ss.ss_family = slave_dev->type;
2054                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2055         }
2056
2057 err_restore_mtu:
2058         dev_set_mtu(slave_dev, new_slave->original_mtu);
2059
2060 err_free:
2061         kobject_put(&new_slave->kobj);
2062
2063 err_undo_flags:
2064         /* Enslave of first slave has failed and we need to fix master's mac */
2065         if (!bond_has_slaves(bond)) {
2066                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
2067                                             slave_dev->dev_addr))
2068                         eth_hw_addr_random(bond_dev);
2069                 if (bond_dev->type != ARPHRD_ETHER) {
2070                         dev_close(bond_dev);
2071                         ether_setup(bond_dev);
2072                         bond_dev->flags |= IFF_MASTER;
2073                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2074                 }
2075         }
2076
2077         return res;
2078 }
2079
2080 /* Try to release the slave device <slave> from the bond device <master>
2081  * It is legal to access curr_active_slave without a lock because all the function
2082  * is RTNL-locked. If "all" is true it means that the function is being called
2083  * while destroying a bond interface and all slaves are being released.
2084  *
2085  * The rules for slave state should be:
2086  *   for Active/Backup:
2087  *     Active stays on all backups go down
2088  *   for Bonded connections:
2089  *     The first up interface should be left on and all others downed.
2090  */
2091 static int __bond_release_one(struct net_device *bond_dev,
2092                               struct net_device *slave_dev,
2093                               bool all, bool unregister)
2094 {
2095         struct bonding *bond = netdev_priv(bond_dev);
2096         struct slave *slave, *oldcurrent;
2097         struct sockaddr_storage ss;
2098         int old_flags = bond_dev->flags;
2099         netdev_features_t old_features = bond_dev->features;
2100
2101         /* slave is not a slave or master is not master of this slave */
2102         if (!(slave_dev->flags & IFF_SLAVE) ||
2103             !netdev_has_upper_dev(slave_dev, bond_dev)) {
2104                 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2105                 return -EINVAL;
2106         }
2107
2108         block_netpoll_tx();
2109
2110         slave = bond_get_slave_by_dev(bond, slave_dev);
2111         if (!slave) {
2112                 /* not a slave of this bond */
2113                 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2114                 unblock_netpoll_tx();
2115                 return -EINVAL;
2116         }
2117
2118         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2119
2120         bond_sysfs_slave_del(slave);
2121
2122         /* recompute stats just before removing the slave */
2123         bond_get_stats(bond->dev, &bond->bond_stats);
2124
2125         bond_upper_dev_unlink(bond, slave);
2126         /* unregister rx_handler early so bond_handle_frame wouldn't be called
2127          * for this slave anymore.
2128          */
2129         netdev_rx_handler_unregister(slave_dev);
2130
2131         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2132                 bond_3ad_unbind_slave(slave);
2133
2134         if (bond_mode_can_use_xmit_hash(bond))
2135                 bond_update_slave_arr(bond, slave);
2136
2137         slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2138                     bond_is_active_slave(slave) ? "active" : "backup");
2139
2140         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2141
2142         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2143
2144         if (!all && (!bond->params.fail_over_mac ||
2145                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2146                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2147                     bond_has_slaves(bond))
2148                         slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n",
2149                                    slave->perm_hwaddr);
2150         }
2151
2152         if (rtnl_dereference(bond->primary_slave) == slave)
2153                 RCU_INIT_POINTER(bond->primary_slave, NULL);
2154
2155         if (oldcurrent == slave)
2156                 bond_change_active_slave(bond, NULL);
2157
2158         if (bond_is_lb(bond)) {
2159                 /* Must be called only after the slave has been
2160                  * detached from the list and the curr_active_slave
2161                  * has been cleared (if our_slave == old_current),
2162                  * but before a new active slave is selected.
2163                  */
2164                 bond_alb_deinit_slave(bond, slave);
2165         }
2166
2167         if (all) {
2168                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2169         } else if (oldcurrent == slave) {
2170                 /* Note that we hold RTNL over this sequence, so there
2171                  * is no concern that another slave add/remove event
2172                  * will interfere.
2173                  */
2174                 bond_select_active_slave(bond);
2175         }
2176
2177         if (!bond_has_slaves(bond)) {
2178                 bond_set_carrier(bond);
2179                 eth_hw_addr_random(bond_dev);
2180         }
2181
2182         unblock_netpoll_tx();
2183         synchronize_rcu();
2184         bond->slave_cnt--;
2185
2186         if (!bond_has_slaves(bond)) {
2187                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2188                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2189         }
2190
2191         bond_compute_features(bond);
2192         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2193             (old_features & NETIF_F_VLAN_CHALLENGED))
2194                 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2195
2196         vlan_vids_del_by_dev(slave_dev, bond_dev);
2197
2198         /* If the mode uses primary, then this case was handled above by
2199          * bond_change_active_slave(..., NULL)
2200          */
2201         if (!bond_uses_primary(bond)) {
2202                 /* unset promiscuity level from slave
2203                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
2204                  * of the IFF_PROMISC flag in the bond_dev, but we need the
2205                  * value of that flag before that change, as that was the value
2206                  * when this slave was attached, so we cache at the start of the
2207                  * function and use it here. Same goes for ALLMULTI below
2208                  */
2209                 if (old_flags & IFF_PROMISC)
2210                         dev_set_promiscuity(slave_dev, -1);
2211
2212                 /* unset allmulti level from slave */
2213                 if (old_flags & IFF_ALLMULTI)
2214                         dev_set_allmulti(slave_dev, -1);
2215
2216                 bond_hw_addr_flush(bond_dev, slave_dev);
2217         }
2218
2219         slave_disable_netpoll(slave);
2220
2221         /* close slave before restoring its mac address */
2222         dev_close(slave_dev);
2223
2224         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2225             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2226                 /* restore original ("permanent") mac address */
2227                 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2228                                   slave->dev->addr_len);
2229                 ss.ss_family = slave_dev->type;
2230                 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2231         }
2232
2233         if (unregister)
2234                 __dev_set_mtu(slave_dev, slave->original_mtu);
2235         else
2236                 dev_set_mtu(slave_dev, slave->original_mtu);
2237
2238         if (!netif_is_bond_master(slave_dev))
2239                 slave_dev->priv_flags &= ~IFF_BONDING;
2240
2241         kobject_put(&slave->kobj);
2242
2243         return 0;
2244 }
2245
2246 /* A wrapper used because of ndo_del_link */
2247 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2248 {
2249         return __bond_release_one(bond_dev, slave_dev, false, false);
2250 }
2251
2252 /* First release a slave and then destroy the bond if no more slaves are left.
2253  * Must be under rtnl_lock when this function is called.
2254  */
2255 static int bond_release_and_destroy(struct net_device *bond_dev,
2256                                     struct net_device *slave_dev)
2257 {
2258         struct bonding *bond = netdev_priv(bond_dev);
2259         int ret;
2260
2261         ret = __bond_release_one(bond_dev, slave_dev, false, true);
2262         if (ret == 0 && !bond_has_slaves(bond) &&
2263             bond_dev->reg_state != NETREG_UNREGISTERING) {
2264                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2265                 netdev_info(bond_dev, "Destroying bond\n");
2266                 bond_remove_proc_entry(bond);
2267                 unregister_netdevice(bond_dev);
2268         }
2269         return ret;
2270 }
2271
2272 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2273 {
2274         struct bonding *bond = netdev_priv(bond_dev);
2275         bond_fill_ifbond(bond, info);
2276 }
2277
2278 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2279 {
2280         struct bonding *bond = netdev_priv(bond_dev);
2281         struct list_head *iter;
2282         int i = 0, res = -ENODEV;
2283         struct slave *slave;
2284
2285         bond_for_each_slave(bond, slave, iter) {
2286                 if (i++ == (int)info->slave_id) {
2287                         res = 0;
2288                         bond_fill_ifslave(slave, info);
2289                         break;
2290                 }
2291         }
2292
2293         return res;
2294 }
2295
2296 /*-------------------------------- Monitoring -------------------------------*/
2297
2298 /* called with rcu_read_lock() */
2299 static int bond_miimon_inspect(struct bonding *bond)
2300 {
2301         int link_state, commit = 0;
2302         struct list_head *iter;
2303         struct slave *slave;
2304         bool ignore_updelay;
2305
2306         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2307
2308         bond_for_each_slave_rcu(bond, slave, iter) {
2309                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2310
2311                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2312
2313                 switch (slave->link) {
2314                 case BOND_LINK_UP:
2315                         if (link_state)
2316                                 continue;
2317
2318                         bond_propose_link_state(slave, BOND_LINK_FAIL);
2319                         commit++;
2320                         slave->delay = bond->params.downdelay;
2321                         if (slave->delay) {
2322                                 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2323                                            (BOND_MODE(bond) ==
2324                                             BOND_MODE_ACTIVEBACKUP) ?
2325                                             (bond_is_active_slave(slave) ?
2326                                              "active " : "backup ") : "",
2327                                            bond->params.downdelay * bond->params.miimon);
2328                         }
2329                         fallthrough;
2330                 case BOND_LINK_FAIL:
2331                         if (link_state) {
2332                                 /* recovered before downdelay expired */
2333                                 bond_propose_link_state(slave, BOND_LINK_UP);
2334                                 slave->last_link_up = jiffies;
2335                                 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2336                                            (bond->params.downdelay - slave->delay) *
2337                                            bond->params.miimon);
2338                                 commit++;
2339                                 continue;
2340                         }
2341
2342                         if (slave->delay <= 0) {
2343                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2344                                 commit++;
2345                                 continue;
2346                         }
2347
2348                         slave->delay--;
2349                         break;
2350
2351                 case BOND_LINK_DOWN:
2352                         if (!link_state)
2353                                 continue;
2354
2355                         bond_propose_link_state(slave, BOND_LINK_BACK);
2356                         commit++;
2357                         slave->delay = bond->params.updelay;
2358
2359                         if (slave->delay) {
2360                                 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2361                                            ignore_updelay ? 0 :
2362                                            bond->params.updelay *
2363                                            bond->params.miimon);
2364                         }
2365                         fallthrough;
2366                 case BOND_LINK_BACK:
2367                         if (!link_state) {
2368                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2369                                 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2370                                            (bond->params.updelay - slave->delay) *
2371                                            bond->params.miimon);
2372                                 commit++;
2373                                 continue;
2374                         }
2375
2376                         if (ignore_updelay)
2377                                 slave->delay = 0;
2378
2379                         if (slave->delay <= 0) {
2380                                 bond_propose_link_state(slave, BOND_LINK_UP);
2381                                 commit++;
2382                                 ignore_updelay = false;
2383                                 continue;
2384                         }
2385
2386                         slave->delay--;
2387                         break;
2388                 }
2389         }
2390
2391         return commit;
2392 }
2393
2394 static void bond_miimon_link_change(struct bonding *bond,
2395                                     struct slave *slave,
2396                                     char link)
2397 {
2398         switch (BOND_MODE(bond)) {
2399         case BOND_MODE_8023AD:
2400                 bond_3ad_handle_link_change(slave, link);
2401                 break;
2402         case BOND_MODE_TLB:
2403         case BOND_MODE_ALB:
2404                 bond_alb_handle_link_change(bond, slave, link);
2405                 break;
2406         case BOND_MODE_XOR:
2407                 bond_update_slave_arr(bond, NULL);
2408                 break;
2409         }
2410 }
2411
2412 static void bond_miimon_commit(struct bonding *bond)
2413 {
2414         struct list_head *iter;
2415         struct slave *slave, *primary;
2416
2417         bond_for_each_slave(bond, slave, iter) {
2418                 switch (slave->link_new_state) {
2419                 case BOND_LINK_NOCHANGE:
2420                         /* For 802.3ad mode, check current slave speed and
2421                          * duplex again in case its port was disabled after
2422                          * invalid speed/duplex reporting but recovered before
2423                          * link monitoring could make a decision on the actual
2424                          * link status
2425                          */
2426                         if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2427                             slave->link == BOND_LINK_UP)
2428                                 bond_3ad_adapter_speed_duplex_changed(slave);
2429                         continue;
2430
2431                 case BOND_LINK_UP:
2432                         if (bond_update_speed_duplex(slave) &&
2433                             bond_needs_speed_duplex(bond)) {
2434                                 slave->link = BOND_LINK_DOWN;
2435                                 if (net_ratelimit())
2436                                         slave_warn(bond->dev, slave->dev,
2437                                                    "failed to get link speed/duplex\n");
2438                                 continue;
2439                         }
2440                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2441                                                   BOND_SLAVE_NOTIFY_NOW);
2442                         slave->last_link_up = jiffies;
2443
2444                         primary = rtnl_dereference(bond->primary_slave);
2445                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2446                                 /* prevent it from being the active one */
2447                                 bond_set_backup_slave(slave);
2448                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2449                                 /* make it immediately active */
2450                                 bond_set_active_slave(slave);
2451                         }
2452
2453                         slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2454                                    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2455                                    slave->duplex ? "full" : "half");
2456
2457                         bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2458
2459                         if (!bond->curr_active_slave || slave == primary)
2460                                 goto do_failover;
2461
2462                         continue;
2463
2464                 case BOND_LINK_DOWN:
2465                         if (slave->link_failure_count < UINT_MAX)
2466                                 slave->link_failure_count++;
2467
2468                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2469                                                   BOND_SLAVE_NOTIFY_NOW);
2470
2471                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2472                             BOND_MODE(bond) == BOND_MODE_8023AD)
2473                                 bond_set_slave_inactive_flags(slave,
2474                                                               BOND_SLAVE_NOTIFY_NOW);
2475
2476                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2477
2478                         bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2479
2480                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2481                                 goto do_failover;
2482
2483                         continue;
2484
2485                 default:
2486                         slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2487                                   slave->link_new_state);
2488                         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2489
2490                         continue;
2491                 }
2492
2493 do_failover:
2494                 block_netpoll_tx();
2495                 bond_select_active_slave(bond);
2496                 unblock_netpoll_tx();
2497         }
2498
2499         bond_set_carrier(bond);
2500 }
2501
2502 /* bond_mii_monitor
2503  *
2504  * Really a wrapper that splits the mii monitor into two phases: an
2505  * inspection, then (if inspection indicates something needs to be done)
2506  * an acquisition of appropriate locks followed by a commit phase to
2507  * implement whatever link state changes are indicated.
2508  */
2509 static void bond_mii_monitor(struct work_struct *work)
2510 {
2511         struct bonding *bond = container_of(work, struct bonding,
2512                                             mii_work.work);
2513         bool should_notify_peers = false;
2514         bool commit;
2515         unsigned long delay;
2516         struct slave *slave;
2517         struct list_head *iter;
2518
2519         delay = msecs_to_jiffies(bond->params.miimon);
2520
2521         if (!bond_has_slaves(bond))
2522                 goto re_arm;
2523
2524         rcu_read_lock();
2525         should_notify_peers = bond_should_notify_peers(bond);
2526         commit = !!bond_miimon_inspect(bond);
2527         if (bond->send_peer_notif) {
2528                 rcu_read_unlock();
2529                 if (rtnl_trylock()) {
2530                         bond->send_peer_notif--;
2531                         rtnl_unlock();
2532                 }
2533         } else {
2534                 rcu_read_unlock();
2535         }
2536
2537         if (commit) {
2538                 /* Race avoidance with bond_close cancel of workqueue */
2539                 if (!rtnl_trylock()) {
2540                         delay = 1;
2541                         should_notify_peers = false;
2542                         goto re_arm;
2543                 }
2544
2545                 bond_for_each_slave(bond, slave, iter) {
2546                         bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2547                 }
2548                 bond_miimon_commit(bond);
2549
2550                 rtnl_unlock();  /* might sleep, hold no other locks */
2551         }
2552
2553 re_arm:
2554         if (bond->params.miimon)
2555                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2556
2557         if (should_notify_peers) {
2558                 if (!rtnl_trylock())
2559                         return;
2560                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2561                 rtnl_unlock();
2562         }
2563 }
2564
2565 static int bond_upper_dev_walk(struct net_device *upper,
2566                                struct netdev_nested_priv *priv)
2567 {
2568         __be32 ip = *(__be32 *)priv->data;
2569
2570         return ip == bond_confirm_addr(upper, 0, ip);
2571 }
2572
2573 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2574 {
2575         struct netdev_nested_priv priv = {
2576                 .data = (void *)&ip,
2577         };
2578         bool ret = false;
2579
2580         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2581                 return true;
2582
2583         rcu_read_lock();
2584         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2585                 ret = true;
2586         rcu_read_unlock();
2587
2588         return ret;
2589 }
2590
2591 /* We go to the (large) trouble of VLAN tagging ARP frames because
2592  * switches in VLAN mode (especially if ports are configured as
2593  * "native" to a VLAN) might not pass non-tagged frames.
2594  */
2595 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2596                           __be32 src_ip, struct bond_vlan_tag *tags)
2597 {
2598         struct sk_buff *skb;
2599         struct bond_vlan_tag *outer_tag = tags;
2600         struct net_device *slave_dev = slave->dev;
2601         struct net_device *bond_dev = slave->bond->dev;
2602
2603         slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2604                   arp_op, &dest_ip, &src_ip);
2605
2606         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2607                          NULL, slave_dev->dev_addr, NULL);
2608
2609         if (!skb) {
2610                 net_err_ratelimited("ARP packet allocation failed\n");
2611                 return;
2612         }
2613
2614         if (!tags || tags->vlan_proto == VLAN_N_VID)
2615                 goto xmit;
2616
2617         tags++;
2618
2619         /* Go through all the tags backwards and add them to the packet */
2620         while (tags->vlan_proto != VLAN_N_VID) {
2621                 if (!tags->vlan_id) {
2622                         tags++;
2623                         continue;
2624                 }
2625
2626                 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2627                           ntohs(outer_tag->vlan_proto), tags->vlan_id);
2628                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2629                                                 tags->vlan_id);
2630                 if (!skb) {
2631                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2632                         return;
2633                 }
2634
2635                 tags++;
2636         }
2637         /* Set the outer tag */
2638         if (outer_tag->vlan_id) {
2639                 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2640                           ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2641                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2642                                        outer_tag->vlan_id);
2643         }
2644
2645 xmit:
2646         arp_xmit(skb);
2647 }
2648
2649 /* Validate the device path between the @start_dev and the @end_dev.
2650  * The path is valid if the @end_dev is reachable through device
2651  * stacking.
2652  * When the path is validated, collect any vlan information in the
2653  * path.
2654  */
2655 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2656                                               struct net_device *end_dev,
2657                                               int level)
2658 {
2659         struct bond_vlan_tag *tags;
2660         struct net_device *upper;
2661         struct list_head  *iter;
2662
2663         if (start_dev == end_dev) {
2664                 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2665                 if (!tags)
2666                         return ERR_PTR(-ENOMEM);
2667                 tags[level].vlan_proto = VLAN_N_VID;
2668                 return tags;
2669         }
2670
2671         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2672                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2673                 if (IS_ERR_OR_NULL(tags)) {
2674                         if (IS_ERR(tags))
2675                                 return tags;
2676                         continue;
2677                 }
2678                 if (is_vlan_dev(upper)) {
2679                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2680                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2681                 }
2682
2683                 return tags;
2684         }
2685
2686         return NULL;
2687 }
2688
2689 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2690 {
2691         struct rtable *rt;
2692         struct bond_vlan_tag *tags;
2693         __be32 *targets = bond->params.arp_targets, addr;
2694         int i;
2695
2696         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2697                 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2698                           __func__, &targets[i]);
2699                 tags = NULL;
2700
2701                 /* Find out through which dev should the packet go */
2702                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2703                                      RTO_ONLINK, 0);
2704                 if (IS_ERR(rt)) {
2705                         /* there's no route to target - try to send arp
2706                          * probe to generate any traffic (arp_validate=0)
2707                          */
2708                         if (bond->params.arp_validate)
2709                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2710                                                      bond->dev->name,
2711                                                      &targets[i]);
2712                         bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2713                                       0, tags);
2714                         continue;
2715                 }
2716
2717                 /* bond device itself */
2718                 if (rt->dst.dev == bond->dev)
2719                         goto found;
2720
2721                 rcu_read_lock();
2722                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2723                 rcu_read_unlock();
2724
2725                 if (!IS_ERR_OR_NULL(tags))
2726                         goto found;
2727
2728                 /* Not our device - skip */
2729                 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2730                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2731
2732                 ip_rt_put(rt);
2733                 continue;
2734
2735 found:
2736                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2737                 ip_rt_put(rt);
2738                 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2739                 kfree(tags);
2740         }
2741 }
2742
2743 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2744 {
2745         int i;
2746
2747         if (!sip || !bond_has_this_ip(bond, tip)) {
2748                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2749                            __func__, &sip, &tip);
2750                 return;
2751         }
2752
2753         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2754         if (i == -1) {
2755                 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2756                            __func__, &sip);
2757                 return;
2758         }
2759         slave->last_rx = jiffies;
2760         slave->target_last_arp_rx[i] = jiffies;
2761 }
2762
2763 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2764                  struct slave *slave)
2765 {
2766         struct arphdr *arp = (struct arphdr *)skb->data;
2767         struct slave *curr_active_slave, *curr_arp_slave;
2768         unsigned char *arp_ptr;
2769         __be32 sip, tip;
2770         int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2771         unsigned int alen;
2772
2773         if (!slave_do_arp_validate(bond, slave)) {
2774                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2775                     !slave_do_arp_validate_only(bond))
2776                         slave->last_rx = jiffies;
2777                 return RX_HANDLER_ANOTHER;
2778         } else if (!is_arp) {
2779                 return RX_HANDLER_ANOTHER;
2780         }
2781
2782         alen = arp_hdr_len(bond->dev);
2783
2784         slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2785                    __func__, skb->dev->name);
2786
2787         if (alen > skb_headlen(skb)) {
2788                 arp = kmalloc(alen, GFP_ATOMIC);
2789                 if (!arp)
2790                         goto out_unlock;
2791                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2792                         goto out_unlock;
2793         }
2794
2795         if (arp->ar_hln != bond->dev->addr_len ||
2796             skb->pkt_type == PACKET_OTHERHOST ||
2797             skb->pkt_type == PACKET_LOOPBACK ||
2798             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2799             arp->ar_pro != htons(ETH_P_IP) ||
2800             arp->ar_pln != 4)
2801                 goto out_unlock;
2802
2803         arp_ptr = (unsigned char *)(arp + 1);
2804         arp_ptr += bond->dev->addr_len;
2805         memcpy(&sip, arp_ptr, 4);
2806         arp_ptr += 4 + bond->dev->addr_len;
2807         memcpy(&tip, arp_ptr, 4);
2808
2809         slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2810                   __func__, slave->dev->name, bond_slave_state(slave),
2811                   bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2812                   &sip, &tip);
2813
2814         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2815         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2816
2817         /* We 'trust' the received ARP enough to validate it if:
2818          *
2819          * (a) the slave receiving the ARP is active (which includes the
2820          * current ARP slave, if any), or
2821          *
2822          * (b) the receiving slave isn't active, but there is a currently
2823          * active slave and it received valid arp reply(s) after it became
2824          * the currently active slave, or
2825          *
2826          * (c) there is an ARP slave that sent an ARP during the prior ARP
2827          * interval, and we receive an ARP reply on any slave.  We accept
2828          * these because switch FDB update delays may deliver the ARP
2829          * reply to a slave other than the sender of the ARP request.
2830          *
2831          * Note: for (b), backup slaves are receiving the broadcast ARP
2832          * request, not a reply.  This request passes from the sending
2833          * slave through the L2 switch(es) to the receiving slave.  Since
2834          * this is checking the request, sip/tip are swapped for
2835          * validation.
2836          *
2837          * This is done to avoid endless looping when we can't reach the
2838          * arp_ip_target and fool ourselves with our own arp requests.
2839          */
2840         if (bond_is_active_slave(slave))
2841                 bond_validate_arp(bond, slave, sip, tip);
2842         else if (curr_active_slave &&
2843                  time_after(slave_last_rx(bond, curr_active_slave),
2844                             curr_active_slave->last_link_up))
2845                 bond_validate_arp(bond, slave, tip, sip);
2846         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2847                  bond_time_in_interval(bond,
2848                                        dev_trans_start(curr_arp_slave->dev), 1))
2849                 bond_validate_arp(bond, slave, sip, tip);
2850
2851 out_unlock:
2852         if (arp != (struct arphdr *)skb->data)
2853                 kfree(arp);
2854         return RX_HANDLER_ANOTHER;
2855 }
2856
2857 /* function to verify if we're in the arp_interval timeslice, returns true if
2858  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2859  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2860  */
2861 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2862                                   int mod)
2863 {
2864         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2865
2866         return time_in_range(jiffies,
2867                              last_act - delta_in_ticks,
2868                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2869 }
2870
2871 /* This function is called regularly to monitor each slave's link
2872  * ensuring that traffic is being sent and received when arp monitoring
2873  * is used in load-balancing mode. if the adapter has been dormant, then an
2874  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2875  * arp monitoring in active backup mode.
2876  */
2877 static void bond_loadbalance_arp_mon(struct bonding *bond)
2878 {
2879         struct slave *slave, *oldcurrent;
2880         struct list_head *iter;
2881         int do_failover = 0, slave_state_changed = 0;
2882
2883         if (!bond_has_slaves(bond))
2884                 goto re_arm;
2885
2886         rcu_read_lock();
2887
2888         oldcurrent = rcu_dereference(bond->curr_active_slave);
2889         /* see if any of the previous devices are up now (i.e. they have
2890          * xmt and rcv traffic). the curr_active_slave does not come into
2891          * the picture unless it is null. also, slave->last_link_up is not
2892          * needed here because we send an arp on each slave and give a slave
2893          * as long as it needs to get the tx/rx within the delta.
2894          * TODO: what about up/down delay in arp mode? it wasn't here before
2895          *       so it can wait
2896          */
2897         bond_for_each_slave_rcu(bond, slave, iter) {
2898                 unsigned long trans_start = dev_trans_start(slave->dev);
2899
2900                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2901
2902                 if (slave->link != BOND_LINK_UP) {
2903                         if (bond_time_in_interval(bond, trans_start, 1) &&
2904                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2905
2906                                 bond_propose_link_state(slave, BOND_LINK_UP);
2907                                 slave_state_changed = 1;
2908
2909                                 /* primary_slave has no meaning in round-robin
2910                                  * mode. the window of a slave being up and
2911                                  * curr_active_slave being null after enslaving
2912                                  * is closed.
2913                                  */
2914                                 if (!oldcurrent) {
2915                                         slave_info(bond->dev, slave->dev, "link status definitely up\n");
2916                                         do_failover = 1;
2917                                 } else {
2918                                         slave_info(bond->dev, slave->dev, "interface is now up\n");
2919                                 }
2920                         }
2921                 } else {
2922                         /* slave->link == BOND_LINK_UP */
2923
2924                         /* not all switches will respond to an arp request
2925                          * when the source ip is 0, so don't take the link down
2926                          * if we don't know our ip yet
2927                          */
2928                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2929                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2930
2931                                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2932                                 slave_state_changed = 1;
2933
2934                                 if (slave->link_failure_count < UINT_MAX)
2935                                         slave->link_failure_count++;
2936
2937                                 slave_info(bond->dev, slave->dev, "interface is now down\n");
2938
2939                                 if (slave == oldcurrent)
2940                                         do_failover = 1;
2941                         }
2942                 }
2943
2944                 /* note: if switch is in round-robin mode, all links
2945                  * must tx arp to ensure all links rx an arp - otherwise
2946                  * links may oscillate or not come up at all; if switch is
2947                  * in something like xor mode, there is nothing we can
2948                  * do - all replies will be rx'ed on same link causing slaves
2949                  * to be unstable during low/no traffic periods
2950                  */
2951                 if (bond_slave_is_up(slave))
2952                         bond_arp_send_all(bond, slave);
2953         }
2954
2955         rcu_read_unlock();
2956
2957         if (do_failover || slave_state_changed) {
2958                 if (!rtnl_trylock())
2959                         goto re_arm;
2960
2961                 bond_for_each_slave(bond, slave, iter) {
2962                         if (slave->link_new_state != BOND_LINK_NOCHANGE)
2963                                 slave->link = slave->link_new_state;
2964                 }
2965
2966                 if (slave_state_changed) {
2967                         bond_slave_state_change(bond);
2968                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2969                                 bond_update_slave_arr(bond, NULL);
2970                 }
2971                 if (do_failover) {
2972                         block_netpoll_tx();
2973                         bond_select_active_slave(bond);
2974                         unblock_netpoll_tx();
2975                 }
2976                 rtnl_unlock();
2977         }
2978
2979 re_arm:
2980         if (bond->params.arp_interval)
2981                 queue_delayed_work(bond->wq, &bond->arp_work,
2982                                    msecs_to_jiffies(bond->params.arp_interval));
2983 }
2984
2985 /* Called to inspect slaves for active-backup mode ARP monitor link state
2986  * changes.  Sets proposed link state in slaves to specify what action
2987  * should take place for the slave.  Returns 0 if no changes are found, >0
2988  * if changes to link states must be committed.
2989  *
2990  * Called with rcu_read_lock held.
2991  */
2992 static int bond_ab_arp_inspect(struct bonding *bond)
2993 {
2994         unsigned long trans_start, last_rx;
2995         struct list_head *iter;
2996         struct slave *slave;
2997         int commit = 0;
2998
2999         bond_for_each_slave_rcu(bond, slave, iter) {
3000                 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3001                 last_rx = slave_last_rx(bond, slave);
3002
3003                 if (slave->link != BOND_LINK_UP) {
3004                         if (bond_time_in_interval(bond, last_rx, 1)) {
3005                                 bond_propose_link_state(slave, BOND_LINK_UP);
3006                                 commit++;
3007                         } else if (slave->link == BOND_LINK_BACK) {
3008                                 bond_propose_link_state(slave, BOND_LINK_FAIL);
3009                                 commit++;
3010                         }
3011                         continue;
3012                 }
3013
3014                 /* Give slaves 2*delta after being enslaved or made
3015                  * active.  This avoids bouncing, as the last receive
3016                  * times need a full ARP monitor cycle to be updated.
3017                  */
3018                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
3019                         continue;
3020
3021                 /* Backup slave is down if:
3022                  * - No current_arp_slave AND
3023                  * - more than 3*delta since last receive AND
3024                  * - the bond has an IP address
3025                  *
3026                  * Note: a non-null current_arp_slave indicates
3027                  * the curr_active_slave went down and we are
3028                  * searching for a new one; under this condition
3029                  * we only take the curr_active_slave down - this
3030                  * gives each slave a chance to tx/rx traffic
3031                  * before being taken out
3032                  */
3033                 if (!bond_is_active_slave(slave) &&
3034                     !rcu_access_pointer(bond->current_arp_slave) &&
3035                     !bond_time_in_interval(bond, last_rx, 3)) {
3036                         bond_propose_link_state(slave, BOND_LINK_DOWN);
3037                         commit++;
3038                 }
3039
3040                 /* Active slave is down if:
3041                  * - more than 2*delta since transmitting OR
3042                  * - (more than 2*delta since receive AND
3043                  *    the bond has an IP address)
3044                  */
3045                 trans_start = dev_trans_start(slave->dev);
3046                 if (bond_is_active_slave(slave) &&
3047                     (!bond_time_in_interval(bond, trans_start, 2) ||
3048                      !bond_time_in_interval(bond, last_rx, 2))) {
3049                         bond_propose_link_state(slave, BOND_LINK_DOWN);
3050                         commit++;
3051                 }
3052         }
3053
3054         return commit;
3055 }
3056
3057 /* Called to commit link state changes noted by inspection step of
3058  * active-backup mode ARP monitor.
3059  *
3060  * Called with RTNL hold.
3061  */
3062 static void bond_ab_arp_commit(struct bonding *bond)
3063 {
3064         unsigned long trans_start;
3065         struct list_head *iter;
3066         struct slave *slave;
3067
3068         bond_for_each_slave(bond, slave, iter) {
3069                 switch (slave->link_new_state) {
3070                 case BOND_LINK_NOCHANGE:
3071                         continue;
3072
3073                 case BOND_LINK_UP:
3074                         trans_start = dev_trans_start(slave->dev);
3075                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
3076                             (!rtnl_dereference(bond->curr_active_slave) &&
3077                              bond_time_in_interval(bond, trans_start, 1))) {
3078                                 struct slave *current_arp_slave;
3079
3080                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3081                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
3082                                                           BOND_SLAVE_NOTIFY_NOW);
3083                                 if (current_arp_slave) {
3084                                         bond_set_slave_inactive_flags(
3085                                                 current_arp_slave,
3086                                                 BOND_SLAVE_NOTIFY_NOW);
3087                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3088                                 }
3089
3090                                 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3091
3092                                 if (!rtnl_dereference(bond->curr_active_slave) ||
3093                                     slave == rtnl_dereference(bond->primary_slave))
3094                                         goto do_failover;
3095
3096                         }
3097
3098                         continue;
3099
3100                 case BOND_LINK_DOWN:
3101                         if (slave->link_failure_count < UINT_MAX)
3102                                 slave->link_failure_count++;
3103
3104                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3105                                                   BOND_SLAVE_NOTIFY_NOW);
3106                         bond_set_slave_inactive_flags(slave,
3107                                                       BOND_SLAVE_NOTIFY_NOW);
3108
3109                         slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3110
3111                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
3112                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3113                                 goto do_failover;
3114                         }
3115
3116                         continue;
3117
3118                 case BOND_LINK_FAIL:
3119                         bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3120                                                   BOND_SLAVE_NOTIFY_NOW);
3121                         bond_set_slave_inactive_flags(slave,
3122                                                       BOND_SLAVE_NOTIFY_NOW);
3123
3124                         /* A slave has just been enslaved and has become
3125                          * the current active slave.
3126                          */
3127                         if (rtnl_dereference(bond->curr_active_slave))
3128                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3129                         continue;
3130
3131                 default:
3132                         slave_err(bond->dev, slave->dev,
3133                                   "impossible: link_new_state %d on slave\n",
3134                                   slave->link_new_state);
3135                         continue;
3136                 }
3137
3138 do_failover:
3139                 block_netpoll_tx();
3140                 bond_select_active_slave(bond);
3141                 unblock_netpoll_tx();
3142         }
3143
3144         bond_set_carrier(bond);
3145 }
3146
3147 /* Send ARP probes for active-backup mode ARP monitor.
3148  *
3149  * Called with rcu_read_lock held.
3150  */
3151 static bool bond_ab_arp_probe(struct bonding *bond)
3152 {
3153         struct slave *slave, *before = NULL, *new_slave = NULL,
3154                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3155                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3156         struct list_head *iter;
3157         bool found = false;
3158         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3159
3160         if (curr_arp_slave && curr_active_slave)
3161                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3162                             curr_arp_slave->dev->name,
3163                             curr_active_slave->dev->name);
3164
3165         if (curr_active_slave) {
3166                 bond_arp_send_all(bond, curr_active_slave);
3167                 return should_notify_rtnl;
3168         }
3169
3170         /* if we don't have a curr_active_slave, search for the next available
3171          * backup slave from the current_arp_slave and make it the candidate
3172          * for becoming the curr_active_slave
3173          */
3174
3175         if (!curr_arp_slave) {
3176                 curr_arp_slave = bond_first_slave_rcu(bond);
3177                 if (!curr_arp_slave)
3178                         return should_notify_rtnl;
3179         }
3180
3181         bond_for_each_slave_rcu(bond, slave, iter) {
3182                 if (!found && !before && bond_slave_is_up(slave))
3183                         before = slave;
3184
3185                 if (found && !new_slave && bond_slave_is_up(slave))
3186                         new_slave = slave;
3187                 /* if the link state is up at this point, we
3188                  * mark it down - this can happen if we have
3189                  * simultaneous link failures and
3190                  * reselect_active_interface doesn't make this
3191                  * one the current slave so it is still marked
3192                  * up when it is actually down
3193                  */
3194                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3195                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3196                                                   BOND_SLAVE_NOTIFY_LATER);
3197                         if (slave->link_failure_count < UINT_MAX)
3198                                 slave->link_failure_count++;
3199
3200                         bond_set_slave_inactive_flags(slave,
3201                                                       BOND_SLAVE_NOTIFY_LATER);
3202
3203                         slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3204                 }
3205                 if (slave == curr_arp_slave)
3206                         found = true;
3207         }
3208
3209         if (!new_slave && before)
3210                 new_slave = before;
3211
3212         if (!new_slave)
3213                 goto check_state;
3214
3215         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3216                                   BOND_SLAVE_NOTIFY_LATER);
3217         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3218         bond_arp_send_all(bond, new_slave);
3219         new_slave->last_link_up = jiffies;
3220         rcu_assign_pointer(bond->current_arp_slave, new_slave);
3221
3222 check_state:
3223         bond_for_each_slave_rcu(bond, slave, iter) {
3224                 if (slave->should_notify || slave->should_notify_link) {
3225                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3226                         break;
3227                 }
3228         }
3229         return should_notify_rtnl;
3230 }
3231
3232 static void bond_activebackup_arp_mon(struct bonding *bond)
3233 {
3234         bool should_notify_peers = false;
3235         bool should_notify_rtnl = false;
3236         int delta_in_ticks;
3237
3238         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3239
3240         if (!bond_has_slaves(bond))
3241                 goto re_arm;
3242
3243         rcu_read_lock();
3244
3245         should_notify_peers = bond_should_notify_peers(bond);
3246
3247         if (bond_ab_arp_inspect(bond)) {
3248                 rcu_read_unlock();
3249
3250                 /* Race avoidance with bond_close flush of workqueue */
3251                 if (!rtnl_trylock()) {
3252                         delta_in_ticks = 1;
3253                         should_notify_peers = false;
3254                         goto re_arm;
3255                 }
3256
3257                 bond_ab_arp_commit(bond);
3258
3259                 rtnl_unlock();
3260                 rcu_read_lock();
3261         }
3262
3263         should_notify_rtnl = bond_ab_arp_probe(bond);
3264         rcu_read_unlock();
3265
3266 re_arm:
3267         if (bond->params.arp_interval)
3268                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3269
3270         if (should_notify_peers || should_notify_rtnl) {
3271                 if (!rtnl_trylock())
3272                         return;
3273
3274                 if (should_notify_peers)
3275                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3276                                                  bond->dev);
3277                 if (should_notify_rtnl) {
3278                         bond_slave_state_notify(bond);
3279                         bond_slave_link_notify(bond);
3280                 }
3281
3282                 rtnl_unlock();
3283         }
3284 }
3285
3286 static void bond_arp_monitor(struct work_struct *work)
3287 {
3288         struct bonding *bond = container_of(work, struct bonding,
3289                                             arp_work.work);
3290
3291         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3292                 bond_activebackup_arp_mon(bond);
3293         else
3294                 bond_loadbalance_arp_mon(bond);
3295 }
3296
3297 /*-------------------------- netdev event handling --------------------------*/
3298
3299 /* Change device name */
3300 static int bond_event_changename(struct bonding *bond)
3301 {
3302         bond_remove_proc_entry(bond);
3303         bond_create_proc_entry(bond);
3304
3305         bond_debug_reregister(bond);
3306
3307         return NOTIFY_DONE;
3308 }
3309
3310 static int bond_master_netdev_event(unsigned long event,
3311                                     struct net_device *bond_dev)
3312 {
3313         struct bonding *event_bond = netdev_priv(bond_dev);
3314
3315         netdev_dbg(bond_dev, "%s called\n", __func__);
3316
3317         switch (event) {
3318         case NETDEV_CHANGENAME:
3319                 return bond_event_changename(event_bond);
3320         case NETDEV_UNREGISTER:
3321                 bond_remove_proc_entry(event_bond);
3322                 break;
3323         case NETDEV_REGISTER:
3324                 bond_create_proc_entry(event_bond);
3325                 break;
3326         default:
3327                 break;
3328         }
3329
3330         return NOTIFY_DONE;
3331 }
3332
3333 static int bond_slave_netdev_event(unsigned long event,
3334                                    struct net_device *slave_dev)
3335 {
3336         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3337         struct bonding *bond;
3338         struct net_device *bond_dev;
3339
3340         /* A netdev event can be generated while enslaving a device
3341          * before netdev_rx_handler_register is called in which case
3342          * slave will be NULL
3343          */
3344         if (!slave) {
3345                 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3346                 return NOTIFY_DONE;
3347         }
3348
3349         bond_dev = slave->bond->dev;
3350         bond = slave->bond;
3351         primary = rtnl_dereference(bond->primary_slave);
3352
3353         slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3354
3355         switch (event) {
3356         case NETDEV_UNREGISTER:
3357                 if (bond_dev->type != ARPHRD_ETHER)
3358                         bond_release_and_destroy(bond_dev, slave_dev);
3359                 else
3360                         __bond_release_one(bond_dev, slave_dev, false, true);
3361                 break;
3362         case NETDEV_UP:
3363         case NETDEV_CHANGE:
3364                 /* For 802.3ad mode only:
3365                  * Getting invalid Speed/Duplex values here will put slave
3366                  * in weird state. Mark it as link-fail if the link was
3367                  * previously up or link-down if it hasn't yet come up, and
3368                  * let link-monitoring (miimon) set it right when correct
3369                  * speeds/duplex are available.
3370                  */
3371                 if (bond_update_speed_duplex(slave) &&
3372                     BOND_MODE(bond) == BOND_MODE_8023AD) {
3373                         if (slave->last_link_up)
3374                                 slave->link = BOND_LINK_FAIL;
3375                         else
3376                                 slave->link = BOND_LINK_DOWN;
3377                 }
3378
3379                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3380                         bond_3ad_adapter_speed_duplex_changed(slave);
3381                 fallthrough;
3382         case NETDEV_DOWN:
3383                 /* Refresh slave-array if applicable!
3384                  * If the setup does not use miimon or arpmon (mode-specific!),
3385                  * then these events will not cause the slave-array to be
3386                  * refreshed. This will cause xmit to use a slave that is not
3387                  * usable. Avoid such situation by refeshing the array at these
3388                  * events. If these (miimon/arpmon) parameters are configured
3389                  * then array gets refreshed twice and that should be fine!
3390                  */
3391                 if (bond_mode_can_use_xmit_hash(bond))
3392                         bond_update_slave_arr(bond, NULL);
3393                 break;
3394         case NETDEV_CHANGEMTU:
3395                 /* TODO: Should slaves be allowed to
3396                  * independently alter their MTU?  For
3397                  * an active-backup bond, slaves need
3398                  * not be the same type of device, so
3399                  * MTUs may vary.  For other modes,
3400                  * slaves arguably should have the
3401                  * same MTUs. To do this, we'd need to
3402                  * take over the slave's change_mtu
3403                  * function for the duration of their
3404                  * servitude.
3405                  */
3406                 break;
3407         case NETDEV_CHANGENAME:
3408                 /* we don't care if we don't have primary set */
3409                 if (!bond_uses_primary(bond) ||
3410                     !bond->params.primary[0])
3411                         break;
3412
3413                 if (slave == primary) {
3414                         /* slave's name changed - he's no longer primary */
3415                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3416                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3417                         /* we have a new primary slave */
3418                         rcu_assign_pointer(bond->primary_slave, slave);
3419                 } else { /* we didn't change primary - exit */
3420                         break;
3421                 }
3422
3423                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3424                             primary ? slave_dev->name : "none");
3425
3426                 block_netpoll_tx();
3427                 bond_select_active_slave(bond);
3428                 unblock_netpoll_tx();
3429                 break;
3430         case NETDEV_FEAT_CHANGE:
3431                 bond_compute_features(bond);
3432                 break;
3433         case NETDEV_RESEND_IGMP:
3434                 /* Propagate to master device */
3435                 call_netdevice_notifiers(event, slave->bond->dev);
3436                 break;
3437         default:
3438                 break;
3439         }
3440
3441         return NOTIFY_DONE;
3442 }
3443
3444 /* bond_netdev_event: handle netdev notifier chain events.
3445  *
3446  * This function receives events for the netdev chain.  The caller (an
3447  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3448  * locks for us to safely manipulate the slave devices (RTNL lock,
3449  * dev_probe_lock).
3450  */
3451 static int bond_netdev_event(struct notifier_block *this,
3452                              unsigned long event, void *ptr)
3453 {
3454         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3455
3456         netdev_dbg(event_dev, "%s received %s\n",
3457                    __func__, netdev_cmd_to_name(event));
3458
3459         if (!(event_dev->priv_flags & IFF_BONDING))
3460                 return NOTIFY_DONE;
3461
3462         if (event_dev->flags & IFF_MASTER) {
3463                 int ret;
3464
3465                 ret = bond_master_netdev_event(event, event_dev);
3466                 if (ret != NOTIFY_DONE)
3467                         return ret;
3468         }
3469
3470         if (event_dev->flags & IFF_SLAVE)
3471                 return bond_slave_netdev_event(event, event_dev);
3472
3473         return NOTIFY_DONE;
3474 }
3475
3476 static struct notifier_block bond_netdev_notifier = {
3477         .notifier_call = bond_netdev_event,
3478 };
3479
3480 /*---------------------------- Hashing Policies -----------------------------*/
3481
3482 /* L2 hash helper */
3483 static inline u32 bond_eth_hash(struct sk_buff *skb)
3484 {
3485         struct ethhdr *ep, hdr_tmp;
3486
3487         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3488         if (ep)
3489                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3490         return 0;
3491 }
3492
3493 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk,
3494                          int *noff, int *proto, bool l34)
3495 {
3496         const struct ipv6hdr *iph6;
3497         const struct iphdr *iph;
3498
3499         if (skb->protocol == htons(ETH_P_IP)) {
3500                 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph))))
3501                         return false;
3502                 iph = (const struct iphdr *)(skb->data + *noff);
3503                 iph_to_flow_copy_v4addrs(fk, iph);
3504                 *noff += iph->ihl << 2;
3505                 if (!ip_is_fragment(iph))
3506                         *proto = iph->protocol;
3507         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3508                 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph6))))
3509                         return false;
3510                 iph6 = (const struct ipv6hdr *)(skb->data + *noff);
3511                 iph_to_flow_copy_v6addrs(fk, iph6);
3512                 *noff += sizeof(*iph6);
3513                 *proto = iph6->nexthdr;
3514         } else {
3515                 return false;
3516         }
3517
3518         if (l34 && *proto >= 0)
3519                 fk->ports.ports = skb_flow_get_ports(skb, *noff, *proto);
3520
3521         return true;
3522 }
3523
3524 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb)
3525 {
3526         struct ethhdr *mac_hdr = (struct ethhdr *)skb_mac_header(skb);
3527         u32 srcmac_vendor = 0, srcmac_dev = 0;
3528         u16 vlan;
3529         int i;
3530
3531         for (i = 0; i < 3; i++)
3532                 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i];
3533
3534         for (i = 3; i < ETH_ALEN; i++)
3535                 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i];
3536
3537         if (!skb_vlan_tag_present(skb))
3538                 return srcmac_vendor ^ srcmac_dev;
3539
3540         vlan = skb_vlan_tag_get(skb);
3541
3542         return vlan ^ srcmac_vendor ^ srcmac_dev;
3543 }
3544
3545 /* Extract the appropriate headers based on bond's xmit policy */
3546 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3547                               struct flow_keys *fk)
3548 {
3549         bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
3550         int noff, proto = -1;
3551
3552         switch (bond->params.xmit_policy) {
3553         case BOND_XMIT_POLICY_ENCAP23:
3554         case BOND_XMIT_POLICY_ENCAP34:
3555                 memset(fk, 0, sizeof(*fk));
3556                 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
3557                                           fk, NULL, 0, 0, 0, 0);
3558         default:
3559                 break;
3560         }
3561
3562         fk->ports.ports = 0;
3563         memset(&fk->icmp, 0, sizeof(fk->icmp));
3564         noff = skb_network_offset(skb);
3565         if (!bond_flow_ip(skb, fk, &noff, &proto, l34))
3566                 return false;
3567
3568         /* ICMP error packets contains at least 8 bytes of the header
3569          * of the packet which generated the error. Use this information
3570          * to correlate ICMP error packets within the same flow which
3571          * generated the error.
3572          */
3573         if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) {
3574                 skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data,
3575                                       skb_transport_offset(skb),
3576                                       skb_headlen(skb));
3577                 if (proto == IPPROTO_ICMP) {
3578                         if (!icmp_is_err(fk->icmp.type))
3579                                 return true;
3580
3581                         noff += sizeof(struct icmphdr);
3582                 } else if (proto == IPPROTO_ICMPV6) {
3583                         if (!icmpv6_is_err(fk->icmp.type))
3584                                 return true;
3585
3586                         noff += sizeof(struct icmp6hdr);
3587                 }
3588                 return bond_flow_ip(skb, fk, &noff, &proto, l34);
3589         }
3590
3591         return true;
3592 }
3593
3594 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow)
3595 {
3596         hash ^= (__force u32)flow_get_u32_dst(flow) ^
3597                 (__force u32)flow_get_u32_src(flow);
3598         hash ^= (hash >> 16);
3599         hash ^= (hash >> 8);
3600         /* discard lowest hash bit to deal with the common even ports pattern */
3601         return hash >> 1;
3602 }
3603
3604 /**
3605  * bond_xmit_hash - generate a hash value based on the xmit policy
3606  * @bond: bonding device
3607  * @skb: buffer to use for headers
3608  *
3609  * This function will extract the necessary headers from the skb buffer and use
3610  * them to generate a hash based on the xmit_policy set in the bonding device
3611  */
3612 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3613 {
3614         struct flow_keys flow;
3615         u32 hash;
3616
3617         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3618             skb->l4_hash)
3619                 return skb->hash;
3620
3621         if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC)
3622                 return bond_vlan_srcmac_hash(skb);
3623
3624         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3625             !bond_flow_dissect(bond, skb, &flow))
3626                 return bond_eth_hash(skb);
3627
3628         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3629             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
3630                 hash = bond_eth_hash(skb);
3631         } else {
3632                 if (flow.icmp.id)
3633                         memcpy(&hash, &flow.icmp, sizeof(hash));
3634                 else
3635                         memcpy(&hash, &flow.ports.ports, sizeof(hash));
3636         }
3637
3638         return bond_ip_hash(hash, &flow);
3639 }
3640
3641 /*-------------------------- Device entry points ----------------------------*/
3642
3643 void bond_work_init_all(struct bonding *bond)
3644 {
3645         INIT_DELAYED_WORK(&bond->mcast_work,
3646                           bond_resend_igmp_join_requests_delayed);
3647         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3648         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3649         INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3650         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3651         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3652 }
3653
3654 static void bond_work_cancel_all(struct bonding *bond)
3655 {
3656         cancel_delayed_work_sync(&bond->mii_work);
3657         cancel_delayed_work_sync(&bond->arp_work);
3658         cancel_delayed_work_sync(&bond->alb_work);
3659         cancel_delayed_work_sync(&bond->ad_work);
3660         cancel_delayed_work_sync(&bond->mcast_work);
3661         cancel_delayed_work_sync(&bond->slave_arr_work);
3662 }
3663
3664 static int bond_open(struct net_device *bond_dev)
3665 {
3666         struct bonding *bond = netdev_priv(bond_dev);
3667         struct list_head *iter;
3668         struct slave *slave;
3669
3670         /* reset slave->backup and slave->inactive */
3671         if (bond_has_slaves(bond)) {
3672                 bond_for_each_slave(bond, slave, iter) {
3673                         if (bond_uses_primary(bond) &&
3674                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3675                                 bond_set_slave_inactive_flags(slave,
3676                                                               BOND_SLAVE_NOTIFY_NOW);
3677                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3678                                 bond_set_slave_active_flags(slave,
3679                                                             BOND_SLAVE_NOTIFY_NOW);
3680                         }
3681                 }
3682         }
3683
3684         if (bond_is_lb(bond)) {
3685                 /* bond_alb_initialize must be called before the timer
3686                  * is started.
3687                  */
3688                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3689                         return -ENOMEM;
3690                 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3691                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3692         }
3693
3694         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3695                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3696
3697         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3698                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3699                 bond->recv_probe = bond_arp_rcv;
3700         }
3701
3702         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3703                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3704                 /* register to receive LACPDUs */
3705                 bond->recv_probe = bond_3ad_lacpdu_recv;
3706                 bond_3ad_initiate_agg_selection(bond, 1);
3707         }
3708
3709         if (bond_mode_can_use_xmit_hash(bond))
3710                 bond_update_slave_arr(bond, NULL);
3711
3712         return 0;
3713 }
3714
3715 static int bond_close(struct net_device *bond_dev)
3716 {
3717         struct bonding *bond = netdev_priv(bond_dev);
3718
3719         bond_work_cancel_all(bond);
3720         bond->send_peer_notif = 0;
3721         if (bond_is_lb(bond))
3722                 bond_alb_deinitialize(bond);
3723         bond->recv_probe = NULL;
3724
3725         return 0;
3726 }
3727
3728 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3729  * that some drivers can provide 32bit values only.
3730  */
3731 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3732                             const struct rtnl_link_stats64 *_new,
3733                             const struct rtnl_link_stats64 *_old)
3734 {
3735         const u64 *new = (const u64 *)_new;
3736         const u64 *old = (const u64 *)_old;
3737         u64 *res = (u64 *)_res;
3738         int i;
3739
3740         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3741                 u64 nv = new[i];
3742                 u64 ov = old[i];
3743                 s64 delta = nv - ov;
3744
3745                 /* detects if this particular field is 32bit only */
3746                 if (((nv | ov) >> 32) == 0)
3747                         delta = (s64)(s32)((u32)nv - (u32)ov);
3748
3749                 /* filter anomalies, some drivers reset their stats
3750                  * at down/up events.
3751                  */
3752                 if (delta > 0)
3753                         res[i] += delta;
3754         }
3755 }
3756
3757 #ifdef CONFIG_LOCKDEP
3758 static int bond_get_lowest_level_rcu(struct net_device *dev)
3759 {
3760         struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
3761         struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
3762         int cur = 0, max = 0;
3763
3764         now = dev;
3765         iter = &dev->adj_list.lower;
3766
3767         while (1) {
3768                 next = NULL;
3769                 while (1) {
3770                         ldev = netdev_next_lower_dev_rcu(now, &iter);
3771                         if (!ldev)
3772                                 break;
3773
3774                         next = ldev;
3775                         niter = &ldev->adj_list.lower;
3776                         dev_stack[cur] = now;
3777                         iter_stack[cur++] = iter;
3778                         if (max <= cur)
3779                                 max = cur;
3780                         break;
3781                 }
3782
3783                 if (!next) {
3784                         if (!cur)
3785                                 return max;
3786                         next = dev_stack[--cur];
3787                         niter = iter_stack[cur];
3788                 }
3789
3790                 now = next;
3791                 iter = niter;
3792         }
3793
3794         return max;
3795 }
3796 #endif
3797
3798 static void bond_get_stats(struct net_device *bond_dev,
3799                            struct rtnl_link_stats64 *stats)
3800 {
3801         struct bonding *bond = netdev_priv(bond_dev);
3802         struct rtnl_link_stats64 temp;
3803         struct list_head *iter;
3804         struct slave *slave;
3805         int nest_level = 0;
3806
3807
3808         rcu_read_lock();
3809 #ifdef CONFIG_LOCKDEP
3810         nest_level = bond_get_lowest_level_rcu(bond_dev);
3811 #endif
3812
3813         spin_lock_nested(&bond->stats_lock, nest_level);
3814         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3815
3816         bond_for_each_slave_rcu(bond, slave, iter) {
3817                 const struct rtnl_link_stats64 *new =
3818                         dev_get_stats(slave->dev, &temp);
3819
3820                 bond_fold_stats(stats, new, &slave->slave_stats);
3821
3822                 /* save off the slave stats for the next run */
3823                 memcpy(&slave->slave_stats, new, sizeof(*new));
3824         }
3825
3826         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3827         spin_unlock(&bond->stats_lock);
3828         rcu_read_unlock();
3829 }
3830
3831 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3832 {
3833         struct bonding *bond = netdev_priv(bond_dev);
3834         struct net_device *slave_dev = NULL;
3835         struct ifbond k_binfo;
3836         struct ifbond __user *u_binfo = NULL;
3837         struct ifslave k_sinfo;
3838         struct ifslave __user *u_sinfo = NULL;
3839         struct mii_ioctl_data *mii = NULL;
3840         struct bond_opt_value newval;
3841         struct net *net;
3842         int res = 0;
3843
3844         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3845
3846         switch (cmd) {
3847         case SIOCGMIIPHY:
3848                 mii = if_mii(ifr);
3849                 if (!mii)
3850                         return -EINVAL;
3851
3852                 mii->phy_id = 0;
3853                 fallthrough;
3854         case SIOCGMIIREG:
3855                 /* We do this again just in case we were called by SIOCGMIIREG
3856                  * instead of SIOCGMIIPHY.
3857                  */
3858                 mii = if_mii(ifr);
3859                 if (!mii)
3860                         return -EINVAL;
3861
3862                 if (mii->reg_num == 1) {
3863                         mii->val_out = 0;
3864                         if (netif_carrier_ok(bond->dev))
3865                                 mii->val_out = BMSR_LSTATUS;
3866                 }
3867
3868                 return 0;
3869         case BOND_INFO_QUERY_OLD:
3870         case SIOCBONDINFOQUERY:
3871                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3872
3873                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3874                         return -EFAULT;
3875
3876                 bond_info_query(bond_dev, &k_binfo);
3877                 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3878                         return -EFAULT;
3879
3880                 return 0;
3881         case BOND_SLAVE_INFO_QUERY_OLD:
3882         case SIOCBONDSLAVEINFOQUERY:
3883                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3884
3885                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3886                         return -EFAULT;
3887
3888                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3889                 if (res == 0 &&
3890                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3891                         return -EFAULT;
3892
3893                 return res;
3894         default:
3895                 break;
3896         }
3897
3898         net = dev_net(bond_dev);
3899
3900         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3901                 return -EPERM;
3902
3903         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3904
3905         slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3906
3907         if (!slave_dev)
3908                 return -ENODEV;
3909
3910         switch (cmd) {
3911         case BOND_ENSLAVE_OLD:
3912         case SIOCBONDENSLAVE:
3913                 res = bond_enslave(bond_dev, slave_dev, NULL);
3914                 break;
3915         case BOND_RELEASE_OLD:
3916         case SIOCBONDRELEASE:
3917                 res = bond_release(bond_dev, slave_dev);
3918                 break;
3919         case BOND_SETHWADDR_OLD:
3920         case SIOCBONDSETHWADDR:
3921                 res = bond_set_dev_addr(bond_dev, slave_dev);
3922                 break;
3923         case BOND_CHANGE_ACTIVE_OLD:
3924         case SIOCBONDCHANGEACTIVE:
3925                 bond_opt_initstr(&newval, slave_dev->name);
3926                 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3927                                             &newval);
3928                 break;
3929         default:
3930                 res = -EOPNOTSUPP;
3931         }
3932
3933         return res;
3934 }
3935
3936 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3937 {
3938         struct bonding *bond = netdev_priv(bond_dev);
3939
3940         if (change & IFF_PROMISC)
3941                 bond_set_promiscuity(bond,
3942                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3943
3944         if (change & IFF_ALLMULTI)
3945                 bond_set_allmulti(bond,
3946                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3947 }
3948
3949 static void bond_set_rx_mode(struct net_device *bond_dev)
3950 {
3951         struct bonding *bond = netdev_priv(bond_dev);
3952         struct list_head *iter;
3953         struct slave *slave;
3954
3955         rcu_read_lock();
3956         if (bond_uses_primary(bond)) {
3957                 slave = rcu_dereference(bond->curr_active_slave);
3958                 if (slave) {
3959                         dev_uc_sync(slave->dev, bond_dev);
3960                         dev_mc_sync(slave->dev, bond_dev);
3961                 }
3962         } else {
3963                 bond_for_each_slave_rcu(bond, slave, iter) {
3964                         dev_uc_sync_multiple(slave->dev, bond_dev);
3965                         dev_mc_sync_multiple(slave->dev, bond_dev);
3966                 }
3967         }
3968         rcu_read_unlock();
3969 }
3970
3971 static int bond_neigh_init(struct neighbour *n)
3972 {
3973         struct bonding *bond = netdev_priv(n->dev);
3974         const struct net_device_ops *slave_ops;
3975         struct neigh_parms parms;
3976         struct slave *slave;
3977         int ret = 0;
3978
3979         rcu_read_lock();
3980         slave = bond_first_slave_rcu(bond);
3981         if (!slave)
3982                 goto out;
3983         slave_ops = slave->dev->netdev_ops;
3984         if (!slave_ops->ndo_neigh_setup)
3985                 goto out;
3986
3987         /* TODO: find another way [1] to implement this.
3988          * Passing a zeroed structure is fragile,
3989          * but at least we do not pass garbage.
3990          *
3991          * [1] One way would be that ndo_neigh_setup() never touch
3992          *     struct neigh_parms, but propagate the new neigh_setup()
3993          *     back to ___neigh_create() / neigh_parms_alloc()
3994          */
3995         memset(&parms, 0, sizeof(parms));
3996         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3997
3998         if (ret)
3999                 goto out;
4000
4001         if (parms.neigh_setup)
4002                 ret = parms.neigh_setup(n);
4003 out:
4004         rcu_read_unlock();
4005         return ret;
4006 }
4007
4008 /* The bonding ndo_neigh_setup is called at init time beofre any
4009  * slave exists. So we must declare proxy setup function which will
4010  * be used at run time to resolve the actual slave neigh param setup.
4011  *
4012  * It's also called by master devices (such as vlans) to setup their
4013  * underlying devices. In that case - do nothing, we're already set up from
4014  * our init.
4015  */
4016 static int bond_neigh_setup(struct net_device *dev,
4017                             struct neigh_parms *parms)
4018 {
4019         /* modify only our neigh_parms */
4020         if (parms->dev == dev)
4021                 parms->neigh_setup = bond_neigh_init;
4022
4023         return 0;
4024 }
4025
4026 /* Change the MTU of all of a master's slaves to match the master */
4027 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4028 {
4029         struct bonding *bond = netdev_priv(bond_dev);
4030         struct slave *slave, *rollback_slave;
4031         struct list_head *iter;
4032         int res = 0;
4033
4034         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
4035
4036         bond_for_each_slave(bond, slave, iter) {
4037                 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
4038                            slave, slave->dev->netdev_ops->ndo_change_mtu);
4039
4040                 res = dev_set_mtu(slave->dev, new_mtu);
4041
4042                 if (res) {
4043                         /* If we failed to set the slave's mtu to the new value
4044                          * we must abort the operation even in ACTIVE_BACKUP
4045                          * mode, because if we allow the backup slaves to have
4046                          * different mtu values than the active slave we'll
4047                          * need to change their mtu when doing a failover. That
4048                          * means changing their mtu from timer context, which
4049                          * is probably not a good idea.
4050                          */
4051                         slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
4052                                   res, new_mtu);
4053                         goto unwind;
4054                 }
4055         }
4056
4057         bond_dev->mtu = new_mtu;
4058
4059         return 0;
4060
4061 unwind:
4062         /* unwind from head to the slave that failed */
4063         bond_for_each_slave(bond, rollback_slave, iter) {
4064                 int tmp_res;
4065
4066                 if (rollback_slave == slave)
4067                         break;
4068
4069                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4070                 if (tmp_res)
4071                         slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4072                                   tmp_res);
4073         }
4074
4075         return res;
4076 }
4077
4078 /* Change HW address
4079  *
4080  * Note that many devices must be down to change the HW address, and
4081  * downing the master releases all slaves.  We can make bonds full of
4082  * bonding devices to test this, however.
4083  */
4084 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4085 {
4086         struct bonding *bond = netdev_priv(bond_dev);
4087         struct slave *slave, *rollback_slave;
4088         struct sockaddr_storage *ss = addr, tmp_ss;
4089         struct list_head *iter;
4090         int res = 0;
4091
4092         if (BOND_MODE(bond) == BOND_MODE_ALB)
4093                 return bond_alb_set_mac_address(bond_dev, addr);
4094
4095
4096         netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4097
4098         /* If fail_over_mac is enabled, do nothing and return success.
4099          * Returning an error causes ifenslave to fail.
4100          */
4101         if (bond->params.fail_over_mac &&
4102             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4103                 return 0;
4104
4105         if (!is_valid_ether_addr(ss->__data))
4106                 return -EADDRNOTAVAIL;
4107
4108         bond_for_each_slave(bond, slave, iter) {
4109                 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4110                           __func__, slave);
4111                 res = dev_set_mac_address(slave->dev, addr, NULL);
4112                 if (res) {
4113                         /* TODO: consider downing the slave
4114                          * and retry ?
4115                          * User should expect communications
4116                          * breakage anyway until ARP finish
4117                          * updating, so...
4118                          */
4119                         slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4120                                   __func__, res);
4121                         goto unwind;
4122                 }
4123         }
4124
4125         /* success */
4126         memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
4127         return 0;
4128
4129 unwind:
4130         memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4131         tmp_ss.ss_family = bond_dev->type;
4132
4133         /* unwind from head to the slave that failed */
4134         bond_for_each_slave(bond, rollback_slave, iter) {
4135                 int tmp_res;
4136
4137                 if (rollback_slave == slave)
4138                         break;
4139
4140                 tmp_res = dev_set_mac_address(rollback_slave->dev,
4141                                               (struct sockaddr *)&tmp_ss, NULL);
4142                 if (tmp_res) {
4143                         slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4144                                    __func__, tmp_res);
4145                 }
4146         }
4147
4148         return res;
4149 }
4150
4151 /**
4152  * bond_get_slave_by_id - get xmit slave with slave_id
4153  * @bond: bonding device that is transmitting
4154  * @slave_id: slave id up to slave_cnt-1 through which to transmit
4155  *
4156  * This function tries to get slave with slave_id but in case
4157  * it fails, it tries to find the first available slave for transmission.
4158  */
4159 static struct slave *bond_get_slave_by_id(struct bonding *bond,
4160                                           int slave_id)
4161 {
4162         struct list_head *iter;
4163         struct slave *slave;
4164         int i = slave_id;
4165
4166         /* Here we start from the slave with slave_id */
4167         bond_for_each_slave_rcu(bond, slave, iter) {
4168                 if (--i < 0) {
4169                         if (bond_slave_can_tx(slave))
4170                                 return slave;
4171                 }
4172         }
4173
4174         /* Here we start from the first slave up to slave_id */
4175         i = slave_id;
4176         bond_for_each_slave_rcu(bond, slave, iter) {
4177                 if (--i < 0)
4178                         break;
4179                 if (bond_slave_can_tx(slave))
4180                         return slave;
4181         }
4182         /* no slave that can tx has been found */
4183         return NULL;
4184 }
4185
4186 /**
4187  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4188  * @bond: bonding device to use
4189  *
4190  * Based on the value of the bonding device's packets_per_slave parameter
4191  * this function generates a slave id, which is usually used as the next
4192  * slave to transmit through.
4193  */
4194 static u32 bond_rr_gen_slave_id(struct bonding *bond)
4195 {
4196         u32 slave_id;
4197         struct reciprocal_value reciprocal_packets_per_slave;
4198         int packets_per_slave = bond->params.packets_per_slave;
4199
4200         switch (packets_per_slave) {
4201         case 0:
4202                 slave_id = prandom_u32();
4203                 break;
4204         case 1:
4205                 slave_id = bond->rr_tx_counter;
4206                 break;
4207         default:
4208                 reciprocal_packets_per_slave =
4209                         bond->params.reciprocal_packets_per_slave;
4210                 slave_id = reciprocal_divide(bond->rr_tx_counter,
4211                                              reciprocal_packets_per_slave);
4212                 break;
4213         }
4214         bond->rr_tx_counter++;
4215
4216         return slave_id;
4217 }
4218
4219 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4220                                                     struct sk_buff *skb)
4221 {
4222         struct slave *slave;
4223         int slave_cnt;
4224         u32 slave_id;
4225
4226         /* Start with the curr_active_slave that joined the bond as the
4227          * default for sending IGMP traffic.  For failover purposes one
4228          * needs to maintain some consistency for the interface that will
4229          * send the join/membership reports.  The curr_active_slave found
4230          * will send all of this type of traffic.
4231          */
4232         if (skb->protocol == htons(ETH_P_IP)) {
4233                 int noff = skb_network_offset(skb);
4234                 struct iphdr *iph;
4235
4236                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4237                         goto non_igmp;
4238
4239                 iph = ip_hdr(skb);
4240                 if (iph->protocol == IPPROTO_IGMP) {
4241                         slave = rcu_dereference(bond->curr_active_slave);
4242                         if (slave)
4243                                 return slave;
4244                         return bond_get_slave_by_id(bond, 0);
4245                 }
4246         }
4247
4248 non_igmp:
4249         slave_cnt = READ_ONCE(bond->slave_cnt);
4250         if (likely(slave_cnt)) {
4251                 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4252                 return bond_get_slave_by_id(bond, slave_id);
4253         }
4254         return NULL;
4255 }
4256
4257 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4258                                         struct net_device *bond_dev)
4259 {
4260         struct bonding *bond = netdev_priv(bond_dev);
4261         struct slave *slave;
4262
4263         slave = bond_xmit_roundrobin_slave_get(bond, skb);
4264         if (likely(slave))
4265                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4266
4267         return bond_tx_drop(bond_dev, skb);
4268 }
4269
4270 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond,
4271                                                       struct sk_buff *skb)
4272 {
4273         return rcu_dereference(bond->curr_active_slave);
4274 }
4275
4276 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
4277  * the bond has a usable interface.
4278  */
4279 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4280                                           struct net_device *bond_dev)
4281 {
4282         struct bonding *bond = netdev_priv(bond_dev);
4283         struct slave *slave;
4284
4285         slave = bond_xmit_activebackup_slave_get(bond, skb);
4286         if (slave)
4287                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4288
4289         return bond_tx_drop(bond_dev, skb);
4290 }
4291
4292 /* Use this to update slave_array when (a) it's not appropriate to update
4293  * slave_array right away (note that update_slave_array() may sleep)
4294  * and / or (b) RTNL is not held.
4295  */
4296 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4297 {
4298         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4299 }
4300
4301 /* Slave array work handler. Holds only RTNL */
4302 static void bond_slave_arr_handler(struct work_struct *work)
4303 {
4304         struct bonding *bond = container_of(work, struct bonding,
4305                                             slave_arr_work.work);
4306         int ret;
4307
4308         if (!rtnl_trylock())
4309                 goto err;
4310
4311         ret = bond_update_slave_arr(bond, NULL);
4312         rtnl_unlock();
4313         if (ret) {
4314                 pr_warn_ratelimited("Failed to update slave array from WT\n");
4315                 goto err;
4316         }
4317         return;
4318
4319 err:
4320         bond_slave_arr_work_rearm(bond, 1);
4321 }
4322
4323 static void bond_skip_slave(struct bond_up_slave *slaves,
4324                             struct slave *skipslave)
4325 {
4326         int idx;
4327
4328         /* Rare situation where caller has asked to skip a specific
4329          * slave but allocation failed (most likely!). BTW this is
4330          * only possible when the call is initiated from
4331          * __bond_release_one(). In this situation; overwrite the
4332          * skipslave entry in the array with the last entry from the
4333          * array to avoid a situation where the xmit path may choose
4334          * this to-be-skipped slave to send a packet out.
4335          */
4336         for (idx = 0; slaves && idx < slaves->count; idx++) {
4337                 if (skipslave == slaves->arr[idx]) {
4338                         slaves->arr[idx] =
4339                                 slaves->arr[slaves->count - 1];
4340                         slaves->count--;
4341                         break;
4342                 }
4343         }
4344 }
4345
4346 static void bond_set_slave_arr(struct bonding *bond,
4347                                struct bond_up_slave *usable_slaves,
4348                                struct bond_up_slave *all_slaves)
4349 {
4350         struct bond_up_slave *usable, *all;
4351
4352         usable = rtnl_dereference(bond->usable_slaves);
4353         rcu_assign_pointer(bond->usable_slaves, usable_slaves);
4354         kfree_rcu(usable, rcu);
4355
4356         all = rtnl_dereference(bond->all_slaves);
4357         rcu_assign_pointer(bond->all_slaves, all_slaves);
4358         kfree_rcu(all, rcu);
4359 }
4360
4361 static void bond_reset_slave_arr(struct bonding *bond)
4362 {
4363         struct bond_up_slave *usable, *all;
4364
4365         usable = rtnl_dereference(bond->usable_slaves);
4366         if (usable) {
4367                 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4368                 kfree_rcu(usable, rcu);
4369         }
4370
4371         all = rtnl_dereference(bond->all_slaves);
4372         if (all) {
4373                 RCU_INIT_POINTER(bond->all_slaves, NULL);
4374                 kfree_rcu(all, rcu);
4375         }
4376 }
4377
4378 /* Build the usable slaves array in control path for modes that use xmit-hash
4379  * to determine the slave interface -
4380  * (a) BOND_MODE_8023AD
4381  * (b) BOND_MODE_XOR
4382  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
4383  *
4384  * The caller is expected to hold RTNL only and NO other lock!
4385  */
4386 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
4387 {
4388         struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
4389         struct slave *slave;
4390         struct list_head *iter;
4391         int agg_id = 0;
4392         int ret = 0;
4393
4394         might_sleep();
4395
4396         usable_slaves = kzalloc(struct_size(usable_slaves, arr,
4397                                             bond->slave_cnt), GFP_KERNEL);
4398         all_slaves = kzalloc(struct_size(all_slaves, arr,
4399                                          bond->slave_cnt), GFP_KERNEL);
4400         if (!usable_slaves || !all_slaves) {
4401                 ret = -ENOMEM;
4402                 goto out;
4403         }
4404         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4405                 struct ad_info ad_info;
4406
4407                 spin_lock_bh(&bond->mode_lock);
4408                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
4409                         spin_unlock_bh(&bond->mode_lock);
4410                         pr_debug("bond_3ad_get_active_agg_info failed\n");
4411                         /* No active aggragator means it's not safe to use
4412                          * the previous array.
4413                          */
4414                         bond_reset_slave_arr(bond);
4415                         goto out;
4416                 }
4417                 spin_unlock_bh(&bond->mode_lock);
4418                 agg_id = ad_info.aggregator_id;
4419         }
4420         bond_for_each_slave(bond, slave, iter) {
4421                 if (skipslave == slave)
4422                         continue;
4423
4424                 all_slaves->arr[all_slaves->count++] = slave;
4425                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4426                         struct aggregator *agg;
4427
4428                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
4429                         if (!agg || agg->aggregator_identifier != agg_id)
4430                                 continue;
4431                 }
4432                 if (!bond_slave_can_tx(slave))
4433                         continue;
4434
4435                 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4436                           usable_slaves->count);
4437
4438                 usable_slaves->arr[usable_slaves->count++] = slave;
4439         }
4440
4441         bond_set_slave_arr(bond, usable_slaves, all_slaves);
4442         return ret;
4443 out:
4444         if (ret != 0 && skipslave) {
4445                 bond_skip_slave(rtnl_dereference(bond->all_slaves),
4446                                 skipslave);
4447                 bond_skip_slave(rtnl_dereference(bond->usable_slaves),
4448                                 skipslave);
4449         }
4450         kfree_rcu(all_slaves, rcu);
4451         kfree_rcu(usable_slaves, rcu);
4452
4453         return ret;
4454 }
4455
4456 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
4457                                                  struct sk_buff *skb,
4458                                                  struct bond_up_slave *slaves)
4459 {
4460         struct slave *slave;
4461         unsigned int count;
4462         u32 hash;
4463
4464         hash = bond_xmit_hash(bond, skb);
4465         count = slaves ? READ_ONCE(slaves->count) : 0;
4466         if (unlikely(!count))
4467                 return NULL;
4468
4469         slave = slaves->arr[hash % count];
4470         return slave;
4471 }
4472
4473 /* Use this Xmit function for 3AD as well as XOR modes. The current
4474  * usable slave array is formed in the control path. The xmit function
4475  * just calculates hash and sends the packet out.
4476  */
4477 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4478                                      struct net_device *dev)
4479 {
4480         struct bonding *bond = netdev_priv(dev);
4481         struct bond_up_slave *slaves;
4482         struct slave *slave;
4483
4484         slaves = rcu_dereference(bond->usable_slaves);
4485         slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4486         if (likely(slave))
4487                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4488
4489         return bond_tx_drop(dev, skb);
4490 }
4491
4492 /* in broadcast mode, we send everything to all usable interfaces. */
4493 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4494                                        struct net_device *bond_dev)
4495 {
4496         struct bonding *bond = netdev_priv(bond_dev);
4497         struct slave *slave = NULL;
4498         struct list_head *iter;
4499
4500         bond_for_each_slave_rcu(bond, slave, iter) {
4501                 if (bond_is_last_slave(bond, slave))
4502                         break;
4503                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4504                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4505
4506                         if (!skb2) {
4507                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4508                                                     bond_dev->name, __func__);
4509                                 continue;
4510                         }
4511                         bond_dev_queue_xmit(bond, skb2, slave->dev);
4512                 }
4513         }
4514         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4515                 return bond_dev_queue_xmit(bond, skb, slave->dev);
4516
4517         return bond_tx_drop(bond_dev, skb);
4518 }
4519
4520 /*------------------------- Device initialization ---------------------------*/
4521
4522 /* Lookup the slave that corresponds to a qid */
4523 static inline int bond_slave_override(struct bonding *bond,
4524                                       struct sk_buff *skb)
4525 {
4526         struct slave *slave = NULL;
4527         struct list_head *iter;
4528
4529         if (!skb_rx_queue_recorded(skb))
4530                 return 1;
4531
4532         /* Find out if any slaves have the same mapping as this skb. */
4533         bond_for_each_slave_rcu(bond, slave, iter) {
4534                 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4535                         if (bond_slave_is_up(slave) &&
4536                             slave->link == BOND_LINK_UP) {
4537                                 bond_dev_queue_xmit(bond, skb, slave->dev);
4538                                 return 0;
4539                         }
4540                         /* If the slave isn't UP, use default transmit policy. */
4541                         break;
4542                 }
4543         }
4544
4545         return 1;
4546 }
4547
4548
4549 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4550                              struct net_device *sb_dev)
4551 {
4552         /* This helper function exists to help dev_pick_tx get the correct
4553          * destination queue.  Using a helper function skips a call to
4554          * skb_tx_hash and will put the skbs in the queue we expect on their
4555          * way down to the bonding driver.
4556          */
4557         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4558
4559         /* Save the original txq to restore before passing to the driver */
4560         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4561
4562         if (unlikely(txq >= dev->real_num_tx_queues)) {
4563                 do {
4564                         txq -= dev->real_num_tx_queues;
4565                 } while (txq >= dev->real_num_tx_queues);
4566         }
4567         return txq;
4568 }
4569
4570 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
4571                                               struct sk_buff *skb,
4572                                               bool all_slaves)
4573 {
4574         struct bonding *bond = netdev_priv(master_dev);
4575         struct bond_up_slave *slaves;
4576         struct slave *slave = NULL;
4577
4578         switch (BOND_MODE(bond)) {
4579         case BOND_MODE_ROUNDROBIN:
4580                 slave = bond_xmit_roundrobin_slave_get(bond, skb);
4581                 break;
4582         case BOND_MODE_ACTIVEBACKUP:
4583                 slave = bond_xmit_activebackup_slave_get(bond, skb);
4584                 break;
4585         case BOND_MODE_8023AD:
4586         case BOND_MODE_XOR:
4587                 if (all_slaves)
4588                         slaves = rcu_dereference(bond->all_slaves);
4589                 else
4590                         slaves = rcu_dereference(bond->usable_slaves);
4591                 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4592                 break;
4593         case BOND_MODE_BROADCAST:
4594                 break;
4595         case BOND_MODE_ALB:
4596                 slave = bond_xmit_alb_slave_get(bond, skb);
4597                 break;
4598         case BOND_MODE_TLB:
4599                 slave = bond_xmit_tlb_slave_get(bond, skb);
4600                 break;
4601         default:
4602                 /* Should never happen, mode already checked */
4603                 WARN_ONCE(true, "Unknown bonding mode");
4604                 break;
4605         }
4606
4607         if (slave)
4608                 return slave->dev;
4609         return NULL;
4610 }
4611
4612 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow)
4613 {
4614         switch (sk->sk_family) {
4615 #if IS_ENABLED(CONFIG_IPV6)
4616         case AF_INET6:
4617                 if (sk->sk_ipv6only ||
4618                     ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) {
4619                         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
4620                         flow->addrs.v6addrs.src = inet6_sk(sk)->saddr;
4621                         flow->addrs.v6addrs.dst = sk->sk_v6_daddr;
4622                         break;
4623                 }
4624                 fallthrough;
4625 #endif
4626         default: /* AF_INET */
4627                 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
4628                 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr;
4629                 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr;
4630                 break;
4631         }
4632
4633         flow->ports.src = inet_sk(sk)->inet_sport;
4634         flow->ports.dst = inet_sk(sk)->inet_dport;
4635 }
4636
4637 /**
4638  * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields
4639  * @sk: socket to use for headers
4640  *
4641  * This function will extract the necessary field from the socket and use
4642  * them to generate a hash based on the LAYER34 xmit_policy.
4643  * Assumes that sk is a TCP or UDP socket.
4644  */
4645 static u32 bond_sk_hash_l34(struct sock *sk)
4646 {
4647         struct flow_keys flow;
4648         u32 hash;
4649
4650         bond_sk_to_flow(sk, &flow);
4651
4652         /* L4 */
4653         memcpy(&hash, &flow.ports.ports, sizeof(hash));
4654         /* L3 */
4655         return bond_ip_hash(hash, &flow);
4656 }
4657
4658 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond,
4659                                                   struct sock *sk)
4660 {
4661         struct bond_up_slave *slaves;
4662         struct slave *slave;
4663         unsigned int count;
4664         u32 hash;
4665
4666         slaves = rcu_dereference(bond->usable_slaves);
4667         count = slaves ? READ_ONCE(slaves->count) : 0;
4668         if (unlikely(!count))
4669                 return NULL;
4670
4671         hash = bond_sk_hash_l34(sk);
4672         slave = slaves->arr[hash % count];
4673
4674         return slave->dev;
4675 }
4676
4677 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev,
4678                                                 struct sock *sk)
4679 {
4680         struct bonding *bond = netdev_priv(dev);
4681         struct net_device *lower = NULL;
4682
4683         rcu_read_lock();
4684         if (bond_sk_check(bond))
4685                 lower = __bond_sk_get_lower_dev(bond, sk);
4686         rcu_read_unlock();
4687
4688         return lower;
4689 }
4690
4691 #if IS_ENABLED(CONFIG_TLS_DEVICE)
4692 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb,
4693                                         struct net_device *dev)
4694 {
4695         if (likely(bond_get_slave_by_dev(bond, tls_get_ctx(skb->sk)->netdev)))
4696                 return bond_dev_queue_xmit(bond, skb, tls_get_ctx(skb->sk)->netdev);
4697         return bond_tx_drop(dev, skb);
4698 }
4699 #endif
4700
4701 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4702 {
4703         struct bonding *bond = netdev_priv(dev);
4704
4705         if (bond_should_override_tx_queue(bond) &&
4706             !bond_slave_override(bond, skb))
4707                 return NETDEV_TX_OK;
4708
4709 #if IS_ENABLED(CONFIG_TLS_DEVICE)
4710         if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk))
4711                 return bond_tls_device_xmit(bond, skb, dev);
4712 #endif
4713
4714         switch (BOND_MODE(bond)) {
4715         case BOND_MODE_ROUNDROBIN:
4716                 return bond_xmit_roundrobin(skb, dev);
4717         case BOND_MODE_ACTIVEBACKUP:
4718                 return bond_xmit_activebackup(skb, dev);
4719         case BOND_MODE_8023AD:
4720         case BOND_MODE_XOR:
4721                 return bond_3ad_xor_xmit(skb, dev);
4722         case BOND_MODE_BROADCAST:
4723                 return bond_xmit_broadcast(skb, dev);
4724         case BOND_MODE_ALB:
4725                 return bond_alb_xmit(skb, dev);
4726         case BOND_MODE_TLB:
4727                 return bond_tlb_xmit(skb, dev);
4728         default:
4729                 /* Should never happen, mode already checked */
4730                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4731                 WARN_ON_ONCE(1);
4732                 return bond_tx_drop(dev, skb);
4733         }
4734 }
4735
4736 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4737 {
4738         struct bonding *bond = netdev_priv(dev);
4739         netdev_tx_t ret = NETDEV_TX_OK;
4740
4741         /* If we risk deadlock from transmitting this in the
4742          * netpoll path, tell netpoll to queue the frame for later tx
4743          */
4744         if (unlikely(is_netpoll_tx_blocked(dev)))
4745                 return NETDEV_TX_BUSY;
4746
4747         rcu_read_lock();
4748         if (bond_has_slaves(bond))
4749                 ret = __bond_start_xmit(skb, dev);
4750         else
4751                 ret = bond_tx_drop(dev, skb);
4752         rcu_read_unlock();
4753
4754         return ret;
4755 }
4756
4757 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
4758 {
4759         if (speed == 0 || speed == SPEED_UNKNOWN)
4760                 speed = slave->speed;
4761         else
4762                 speed = min(speed, slave->speed);
4763
4764         return speed;
4765 }
4766
4767 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4768                                            struct ethtool_link_ksettings *cmd)
4769 {
4770         struct bonding *bond = netdev_priv(bond_dev);
4771         struct list_head *iter;
4772         struct slave *slave;
4773         u32 speed = 0;
4774
4775         cmd->base.duplex = DUPLEX_UNKNOWN;
4776         cmd->base.port = PORT_OTHER;
4777
4778         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4779          * do not need to check mode.  Though link speed might not represent
4780          * the true receive or transmit bandwidth (not all modes are symmetric)
4781          * this is an accurate maximum.
4782          */
4783         bond_for_each_slave(bond, slave, iter) {
4784                 if (bond_slave_can_tx(slave)) {
4785                         if (slave->speed != SPEED_UNKNOWN) {
4786                                 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
4787                                         speed = bond_mode_bcast_speed(slave,
4788                                                                       speed);
4789                                 else
4790                                         speed += slave->speed;
4791                         }
4792                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4793                             slave->duplex != DUPLEX_UNKNOWN)
4794                                 cmd->base.duplex = slave->duplex;
4795                 }
4796         }
4797         cmd->base.speed = speed ? : SPEED_UNKNOWN;
4798
4799         return 0;
4800 }
4801
4802 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4803                                      struct ethtool_drvinfo *drvinfo)
4804 {
4805         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4806         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4807                  BOND_ABI_VERSION);
4808 }
4809
4810 static const struct ethtool_ops bond_ethtool_ops = {
4811         .get_drvinfo            = bond_ethtool_get_drvinfo,
4812         .get_link               = ethtool_op_get_link,
4813         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4814 };
4815
4816 static const struct net_device_ops bond_netdev_ops = {
4817         .ndo_init               = bond_init,
4818         .ndo_uninit             = bond_uninit,
4819         .ndo_open               = bond_open,
4820         .ndo_stop               = bond_close,
4821         .ndo_start_xmit         = bond_start_xmit,
4822         .ndo_select_queue       = bond_select_queue,
4823         .ndo_get_stats64        = bond_get_stats,
4824         .ndo_do_ioctl           = bond_do_ioctl,
4825         .ndo_change_rx_flags    = bond_change_rx_flags,
4826         .ndo_set_rx_mode        = bond_set_rx_mode,
4827         .ndo_change_mtu         = bond_change_mtu,
4828         .ndo_set_mac_address    = bond_set_mac_address,
4829         .ndo_neigh_setup        = bond_neigh_setup,
4830         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4831         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4832 #ifdef CONFIG_NET_POLL_CONTROLLER
4833         .ndo_netpoll_setup      = bond_netpoll_setup,
4834         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4835         .ndo_poll_controller    = bond_poll_controller,
4836 #endif
4837         .ndo_add_slave          = bond_enslave,
4838         .ndo_del_slave          = bond_release,
4839         .ndo_fix_features       = bond_fix_features,
4840         .ndo_features_check     = passthru_features_check,
4841         .ndo_get_xmit_slave     = bond_xmit_get_slave,
4842         .ndo_sk_get_lower_dev   = bond_sk_get_lower_dev,
4843 };
4844
4845 static const struct device_type bond_type = {
4846         .name = "bond",
4847 };
4848
4849 static void bond_destructor(struct net_device *bond_dev)
4850 {
4851         struct bonding *bond = netdev_priv(bond_dev);
4852         if (bond->wq)
4853                 destroy_workqueue(bond->wq);
4854 }
4855
4856 void bond_setup(struct net_device *bond_dev)
4857 {
4858         struct bonding *bond = netdev_priv(bond_dev);
4859
4860         spin_lock_init(&bond->mode_lock);
4861         bond->params = bonding_defaults;
4862
4863         /* Initialize pointers */
4864         bond->dev = bond_dev;
4865
4866         /* Initialize the device entry points */
4867         ether_setup(bond_dev);
4868         bond_dev->max_mtu = ETH_MAX_MTU;
4869         bond_dev->netdev_ops = &bond_netdev_ops;
4870         bond_dev->ethtool_ops = &bond_ethtool_ops;
4871
4872         bond_dev->needs_free_netdev = true;
4873         bond_dev->priv_destructor = bond_destructor;
4874
4875         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4876
4877         /* Initialize the device options */
4878         bond_dev->flags |= IFF_MASTER;
4879         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4880         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4881
4882 #ifdef CONFIG_XFRM_OFFLOAD
4883         /* set up xfrm device ops (only supported in active-backup right now) */
4884         bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
4885         bond->xs = NULL;
4886 #endif /* CONFIG_XFRM_OFFLOAD */
4887
4888         /* don't acquire bond device's netif_tx_lock when transmitting */
4889         bond_dev->features |= NETIF_F_LLTX;
4890
4891         /* By default, we declare the bond to be fully
4892          * VLAN hardware accelerated capable. Special
4893          * care is taken in the various xmit functions
4894          * when there are slaves that are not hw accel
4895          * capable
4896          */
4897
4898         /* Don't allow bond devices to change network namespaces. */
4899         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4900
4901         bond_dev->hw_features = BOND_VLAN_FEATURES |
4902                                 NETIF_F_HW_VLAN_CTAG_RX |
4903                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4904
4905         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4906         bond_dev->features |= bond_dev->hw_features;
4907         bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4908 #ifdef CONFIG_XFRM_OFFLOAD
4909         bond_dev->hw_features |= BOND_XFRM_FEATURES;
4910         /* Only enable XFRM features if this is an active-backup config */
4911         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4912                 bond_dev->features |= BOND_XFRM_FEATURES;
4913 #endif /* CONFIG_XFRM_OFFLOAD */
4914 #if IS_ENABLED(CONFIG_TLS_DEVICE)
4915         if (bond_sk_check(bond))
4916                 bond_dev->features |= BOND_TLS_FEATURES;
4917 #endif
4918 }
4919
4920 /* Destroy a bonding device.
4921  * Must be under rtnl_lock when this function is called.
4922  */
4923 static void bond_uninit(struct net_device *bond_dev)
4924 {
4925         struct bonding *bond = netdev_priv(bond_dev);
4926         struct bond_up_slave *usable, *all;
4927         struct list_head *iter;
4928         struct slave *slave;
4929
4930         bond_netpoll_cleanup(bond_dev);
4931
4932         /* Release the bonded slaves */
4933         bond_for_each_slave(bond, slave, iter)
4934                 __bond_release_one(bond_dev, slave->dev, true, true);
4935         netdev_info(bond_dev, "Released all slaves\n");
4936
4937         usable = rtnl_dereference(bond->usable_slaves);
4938         if (usable) {
4939                 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4940                 kfree_rcu(usable, rcu);
4941         }
4942
4943         all = rtnl_dereference(bond->all_slaves);
4944         if (all) {
4945                 RCU_INIT_POINTER(bond->all_slaves, NULL);
4946                 kfree_rcu(all, rcu);
4947         }
4948
4949         list_del(&bond->bond_list);
4950
4951         bond_debug_unregister(bond);
4952 }
4953
4954 /*------------------------- Module initialization ---------------------------*/
4955
4956 static int bond_check_params(struct bond_params *params)
4957 {
4958         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4959         struct bond_opt_value newval;
4960         const struct bond_opt_value *valptr;
4961         int arp_all_targets_value = 0;
4962         u16 ad_actor_sys_prio = 0;
4963         u16 ad_user_port_key = 0;
4964         __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4965         int arp_ip_count;
4966         int bond_mode   = BOND_MODE_ROUNDROBIN;
4967         int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4968         int lacp_fast = 0;
4969         int tlb_dynamic_lb;
4970
4971         /* Convert string parameters. */
4972         if (mode) {
4973                 bond_opt_initstr(&newval, mode);
4974                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4975                 if (!valptr) {
4976                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4977                         return -EINVAL;
4978                 }
4979                 bond_mode = valptr->value;
4980         }
4981
4982         if (xmit_hash_policy) {
4983                 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4984                     bond_mode == BOND_MODE_ACTIVEBACKUP ||
4985                     bond_mode == BOND_MODE_BROADCAST) {
4986                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4987                                 bond_mode_name(bond_mode));
4988                 } else {
4989                         bond_opt_initstr(&newval, xmit_hash_policy);
4990                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4991                                                 &newval);
4992                         if (!valptr) {
4993                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4994                                        xmit_hash_policy);
4995                                 return -EINVAL;
4996                         }
4997                         xmit_hashtype = valptr->value;
4998                 }
4999         }
5000
5001         if (lacp_rate) {
5002                 if (bond_mode != BOND_MODE_8023AD) {
5003                         pr_info("lacp_rate param is irrelevant in mode %s\n",
5004                                 bond_mode_name(bond_mode));
5005                 } else {
5006                         bond_opt_initstr(&newval, lacp_rate);
5007                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
5008                                                 &newval);
5009                         if (!valptr) {
5010                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
5011                                        lacp_rate);
5012                                 return -EINVAL;
5013                         }
5014                         lacp_fast = valptr->value;
5015                 }
5016         }
5017
5018         if (ad_select) {
5019                 bond_opt_initstr(&newval, ad_select);
5020                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
5021                                         &newval);
5022                 if (!valptr) {
5023                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
5024                         return -EINVAL;
5025                 }
5026                 params->ad_select = valptr->value;
5027                 if (bond_mode != BOND_MODE_8023AD)
5028                         pr_warn("ad_select param only affects 802.3ad mode\n");
5029         } else {
5030                 params->ad_select = BOND_AD_STABLE;
5031         }
5032
5033         if (max_bonds < 0) {
5034                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
5035                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
5036                 max_bonds = BOND_DEFAULT_MAX_BONDS;
5037         }
5038
5039         if (miimon < 0) {
5040                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5041                         miimon, INT_MAX);
5042                 miimon = 0;
5043         }
5044
5045         if (updelay < 0) {
5046                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5047                         updelay, INT_MAX);
5048                 updelay = 0;
5049         }
5050
5051         if (downdelay < 0) {
5052                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5053                         downdelay, INT_MAX);
5054                 downdelay = 0;
5055         }
5056
5057         if ((use_carrier != 0) && (use_carrier != 1)) {
5058                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
5059                         use_carrier);
5060                 use_carrier = 1;
5061         }
5062
5063         if (num_peer_notif < 0 || num_peer_notif > 255) {
5064                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
5065                         num_peer_notif);
5066                 num_peer_notif = 1;
5067         }
5068
5069         /* reset values for 802.3ad/TLB/ALB */
5070         if (!bond_mode_uses_arp(bond_mode)) {
5071                 if (!miimon) {
5072                         pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
5073                         pr_warn("Forcing miimon to 100msec\n");
5074                         miimon = BOND_DEFAULT_MIIMON;
5075                 }
5076         }
5077
5078         if (tx_queues < 1 || tx_queues > 255) {
5079                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
5080                         tx_queues, BOND_DEFAULT_TX_QUEUES);
5081                 tx_queues = BOND_DEFAULT_TX_QUEUES;
5082         }
5083
5084         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
5085                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
5086                         all_slaves_active);
5087                 all_slaves_active = 0;
5088         }
5089
5090         if (resend_igmp < 0 || resend_igmp > 255) {
5091                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
5092                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
5093                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
5094         }
5095
5096         bond_opt_initval(&newval, packets_per_slave);
5097         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
5098                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
5099                         packets_per_slave, USHRT_MAX);
5100                 packets_per_slave = 1;
5101         }
5102
5103         if (bond_mode == BOND_MODE_ALB) {
5104                 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
5105                           updelay);
5106         }
5107
5108         if (!miimon) {
5109                 if (updelay || downdelay) {
5110                         /* just warn the user the up/down delay will have
5111                          * no effect since miimon is zero...
5112                          */
5113                         pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
5114                                 updelay, downdelay);
5115                 }
5116         } else {
5117                 /* don't allow arp monitoring */
5118                 if (arp_interval) {
5119                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
5120                                 miimon, arp_interval);
5121                         arp_interval = 0;
5122                 }
5123
5124                 if ((updelay % miimon) != 0) {
5125                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
5126                                 updelay, miimon, (updelay / miimon) * miimon);
5127                 }
5128
5129                 updelay /= miimon;
5130
5131                 if ((downdelay % miimon) != 0) {
5132                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
5133                                 downdelay, miimon,
5134                                 (downdelay / miimon) * miimon);
5135                 }
5136
5137                 downdelay /= miimon;
5138         }
5139
5140         if (arp_interval < 0) {
5141                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5142                         arp_interval, INT_MAX);
5143                 arp_interval = 0;
5144         }
5145
5146         for (arp_ip_count = 0, i = 0;
5147              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
5148                 __be32 ip;
5149
5150                 /* not a complete check, but good enough to catch mistakes */
5151                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
5152                     !bond_is_ip_target_ok(ip)) {
5153                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
5154                                 arp_ip_target[i]);
5155                         arp_interval = 0;
5156                 } else {
5157                         if (bond_get_targets_ip(arp_target, ip) == -1)
5158                                 arp_target[arp_ip_count++] = ip;
5159                         else
5160                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
5161                                         &ip);
5162                 }
5163         }
5164
5165         if (arp_interval && !arp_ip_count) {
5166                 /* don't allow arping if no arp_ip_target given... */
5167                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
5168                         arp_interval);
5169                 arp_interval = 0;
5170         }
5171
5172         if (arp_validate) {
5173                 if (!arp_interval) {
5174                         pr_err("arp_validate requires arp_interval\n");
5175                         return -EINVAL;
5176                 }
5177
5178                 bond_opt_initstr(&newval, arp_validate);
5179                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
5180                                         &newval);
5181                 if (!valptr) {
5182                         pr_err("Error: invalid arp_validate \"%s\"\n",
5183                                arp_validate);
5184                         return -EINVAL;
5185                 }
5186                 arp_validate_value = valptr->value;
5187         } else {
5188                 arp_validate_value = 0;
5189         }
5190
5191         if (arp_all_targets) {
5192                 bond_opt_initstr(&newval, arp_all_targets);
5193                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
5194                                         &newval);
5195                 if (!valptr) {
5196                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
5197                                arp_all_targets);
5198                         arp_all_targets_value = 0;
5199                 } else {
5200                         arp_all_targets_value = valptr->value;
5201                 }
5202         }
5203
5204         if (miimon) {
5205                 pr_info("MII link monitoring set to %d ms\n", miimon);
5206         } else if (arp_interval) {
5207                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
5208                                           arp_validate_value);
5209                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5210                         arp_interval, valptr->string, arp_ip_count);
5211
5212                 for (i = 0; i < arp_ip_count; i++)
5213                         pr_cont(" %s", arp_ip_target[i]);
5214
5215                 pr_cont("\n");
5216
5217         } else if (max_bonds) {
5218                 /* miimon and arp_interval not set, we need one so things
5219                  * work as expected, see bonding.txt for details
5220                  */
5221                 pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n");
5222         }
5223
5224         if (primary && !bond_mode_uses_primary(bond_mode)) {
5225                 /* currently, using a primary only makes sense
5226                  * in active backup, TLB or ALB modes
5227                  */
5228                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
5229                         primary, bond_mode_name(bond_mode));
5230                 primary = NULL;
5231         }
5232
5233         if (primary && primary_reselect) {
5234                 bond_opt_initstr(&newval, primary_reselect);
5235                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
5236                                         &newval);
5237                 if (!valptr) {
5238                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
5239                                primary_reselect);
5240                         return -EINVAL;
5241                 }
5242                 primary_reselect_value = valptr->value;
5243         } else {
5244                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5245         }
5246
5247         if (fail_over_mac) {
5248                 bond_opt_initstr(&newval, fail_over_mac);
5249                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
5250                                         &newval);
5251                 if (!valptr) {
5252                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
5253                                fail_over_mac);
5254                         return -EINVAL;
5255                 }
5256                 fail_over_mac_value = valptr->value;
5257                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5258                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
5259         } else {
5260                 fail_over_mac_value = BOND_FOM_NONE;
5261         }
5262
5263         bond_opt_initstr(&newval, "default");
5264         valptr = bond_opt_parse(
5265                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
5266                                      &newval);
5267         if (!valptr) {
5268                 pr_err("Error: No ad_actor_sys_prio default value");
5269                 return -EINVAL;
5270         }
5271         ad_actor_sys_prio = valptr->value;
5272
5273         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
5274                                 &newval);
5275         if (!valptr) {
5276                 pr_err("Error: No ad_user_port_key default value");
5277                 return -EINVAL;
5278         }
5279         ad_user_port_key = valptr->value;
5280
5281         bond_opt_initstr(&newval, "default");
5282         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
5283         if (!valptr) {
5284                 pr_err("Error: No tlb_dynamic_lb default value");
5285                 return -EINVAL;
5286         }
5287         tlb_dynamic_lb = valptr->value;
5288
5289         if (lp_interval == 0) {
5290                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
5291                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
5292                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
5293         }
5294
5295         /* fill params struct with the proper values */
5296         params->mode = bond_mode;
5297         params->xmit_policy = xmit_hashtype;
5298         params->miimon = miimon;
5299         params->num_peer_notif = num_peer_notif;
5300         params->arp_interval = arp_interval;
5301         params->arp_validate = arp_validate_value;
5302         params->arp_all_targets = arp_all_targets_value;
5303         params->updelay = updelay;
5304         params->downdelay = downdelay;
5305         params->peer_notif_delay = 0;
5306         params->use_carrier = use_carrier;
5307         params->lacp_fast = lacp_fast;
5308         params->primary[0] = 0;
5309         params->primary_reselect = primary_reselect_value;
5310         params->fail_over_mac = fail_over_mac_value;
5311         params->tx_queues = tx_queues;
5312         params->all_slaves_active = all_slaves_active;
5313         params->resend_igmp = resend_igmp;
5314         params->min_links = min_links;
5315         params->lp_interval = lp_interval;
5316         params->packets_per_slave = packets_per_slave;
5317         params->tlb_dynamic_lb = tlb_dynamic_lb;
5318         params->ad_actor_sys_prio = ad_actor_sys_prio;
5319         eth_zero_addr(params->ad_actor_system);
5320         params->ad_user_port_key = ad_user_port_key;
5321         if (packets_per_slave > 0) {
5322                 params->reciprocal_packets_per_slave =
5323                         reciprocal_value(packets_per_slave);
5324         } else {
5325                 /* reciprocal_packets_per_slave is unused if
5326                  * packets_per_slave is 0 or 1, just initialize it
5327                  */
5328                 params->reciprocal_packets_per_slave =
5329                         (struct reciprocal_value) { 0 };
5330         }
5331
5332         if (primary) {
5333                 strncpy(params->primary, primary, IFNAMSIZ);
5334                 params->primary[IFNAMSIZ - 1] = 0;
5335         }
5336
5337         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5338
5339         return 0;
5340 }
5341
5342 /* Called from registration process */
5343 static int bond_init(struct net_device *bond_dev)
5344 {
5345         struct bonding *bond = netdev_priv(bond_dev);
5346         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5347
5348         netdev_dbg(bond_dev, "Begin bond_init\n");
5349
5350         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
5351         if (!bond->wq)
5352                 return -ENOMEM;
5353
5354         spin_lock_init(&bond->stats_lock);
5355         netdev_lockdep_set_classes(bond_dev);
5356
5357         list_add_tail(&bond->bond_list, &bn->dev_list);
5358
5359         bond_prepare_sysfs_group(bond);
5360
5361         bond_debug_register(bond);
5362
5363         /* Ensure valid dev_addr */
5364         if (is_zero_ether_addr(bond_dev->dev_addr) &&
5365             bond_dev->addr_assign_type == NET_ADDR_PERM)
5366                 eth_hw_addr_random(bond_dev);
5367
5368         return 0;
5369 }
5370
5371 unsigned int bond_get_num_tx_queues(void)
5372 {
5373         return tx_queues;
5374 }
5375
5376 /* Create a new bond based on the specified name and bonding parameters.
5377  * If name is NULL, obtain a suitable "bond%d" name for us.
5378  * Caller must NOT hold rtnl_lock; we need to release it here before we
5379  * set up our sysfs entries.
5380  */
5381 int bond_create(struct net *net, const char *name)
5382 {
5383         struct net_device *bond_dev;
5384         struct bonding *bond;
5385         struct alb_bond_info *bond_info;
5386         int res;
5387
5388         rtnl_lock();
5389
5390         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
5391                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
5392                                    bond_setup, tx_queues);
5393         if (!bond_dev) {
5394                 pr_err("%s: eek! can't alloc netdev!\n", name);
5395                 rtnl_unlock();
5396                 return -ENOMEM;
5397         }
5398
5399         /*
5400          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
5401          * It is set to 0 by default which is wrong.
5402          */
5403         bond = netdev_priv(bond_dev);
5404         bond_info = &(BOND_ALB_INFO(bond));
5405         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
5406
5407         dev_net_set(bond_dev, net);
5408         bond_dev->rtnl_link_ops = &bond_link_ops;
5409
5410         res = register_netdevice(bond_dev);
5411         if (res < 0) {
5412                 free_netdev(bond_dev);
5413                 rtnl_unlock();
5414
5415                 return res;
5416         }
5417
5418         netif_carrier_off(bond_dev);
5419
5420         bond_work_init_all(bond);
5421
5422         rtnl_unlock();
5423         return 0;
5424 }
5425
5426 static int __net_init bond_net_init(struct net *net)
5427 {
5428         struct bond_net *bn = net_generic(net, bond_net_id);
5429
5430         bn->net = net;
5431         INIT_LIST_HEAD(&bn->dev_list);
5432
5433         bond_create_proc_dir(bn);
5434         bond_create_sysfs(bn);
5435
5436         return 0;
5437 }
5438
5439 static void __net_exit bond_net_exit(struct net *net)
5440 {
5441         struct bond_net *bn = net_generic(net, bond_net_id);
5442         struct bonding *bond, *tmp_bond;
5443         LIST_HEAD(list);
5444
5445         bond_destroy_sysfs(bn);
5446
5447         /* Kill off any bonds created after unregistering bond rtnl ops */
5448         rtnl_lock();
5449         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
5450                 unregister_netdevice_queue(bond->dev, &list);
5451         unregister_netdevice_many(&list);
5452         rtnl_unlock();
5453
5454         bond_destroy_proc_dir(bn);
5455 }
5456
5457 static struct pernet_operations bond_net_ops = {
5458         .init = bond_net_init,
5459         .exit = bond_net_exit,
5460         .id   = &bond_net_id,
5461         .size = sizeof(struct bond_net),
5462 };
5463
5464 static int __init bonding_init(void)
5465 {
5466         int i;
5467         int res;
5468
5469         res = bond_check_params(&bonding_defaults);
5470         if (res)
5471                 goto out;
5472
5473         res = register_pernet_subsys(&bond_net_ops);
5474         if (res)
5475                 goto out;
5476
5477         res = bond_netlink_init();
5478         if (res)
5479                 goto err_link;
5480
5481         bond_create_debugfs();
5482
5483         for (i = 0; i < max_bonds; i++) {
5484                 res = bond_create(&init_net, NULL);
5485                 if (res)
5486                         goto err;
5487         }
5488
5489         skb_flow_dissector_init(&flow_keys_bonding,
5490                                 flow_keys_bonding_keys,
5491                                 ARRAY_SIZE(flow_keys_bonding_keys));
5492
5493         register_netdevice_notifier(&bond_netdev_notifier);
5494 out:
5495         return res;
5496 err:
5497         bond_destroy_debugfs();
5498         bond_netlink_fini();
5499 err_link:
5500         unregister_pernet_subsys(&bond_net_ops);
5501         goto out;
5502
5503 }
5504
5505 static void __exit bonding_exit(void)
5506 {
5507         unregister_netdevice_notifier(&bond_netdev_notifier);
5508
5509         bond_destroy_debugfs();
5510
5511         bond_netlink_fini();
5512         unregister_pernet_subsys(&bond_net_ops);
5513
5514 #ifdef CONFIG_NET_POLL_CONTROLLER
5515         /* Make sure we don't have an imbalance on our netpoll blocking */
5516         WARN_ON(atomic_read(&netpoll_block_tx));
5517 #endif
5518 }
5519
5520 module_init(bonding_init);
5521 module_exit(bonding_exit);
5522 MODULE_LICENSE("GPL");
5523 MODULE_DESCRIPTION(DRV_DESCRIPTION);
5524 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");